for a wavelength at the peak of visual sensitivity, 550 nm , how many photons lead to an observable flash?

Answer: Coral reef structures also buffer shorelines against 97 percent of the energy from waves, storms, and floods, helping to prevent loss of life, property damage, and erosion. When reefs are damaged or destroyed, the absence of this natural barrier can increase the damage to coastal communities from normal wave action and violent storms.

Answer:

Absolutely no real-life phenomena/ uses are possible that are related to any branch of physics, except:

1 The device you are reading this answer on. (quantum mechanics, electronics )

2 The air conditioner in your room. ( electromagnetism, electronics )

3 The satellites and space stations in space which will help in the deciphering of the universe will help us look for a suitable planet when we render the earth useless. ( general and special relativity, classical mechanics )

4 Ohh. I forgot, do you wear clothes, well they are made in factories where factories run on the principles of thermodynamics, which is physics.

5 Ever gone somewhere? Well, the transportation uses classical mechanics, thermodynamics, electromagnetism, relativity ( if you know Global Positioning System )

6 GPS itself! It’s used in online maps, navigating, and this sort of stuff. It works on general relativity.

Honestly, this list is endless.

The wavelength of the sound wave is equal to 0.333 m. Therefore, option (c) is correct.

The frequency of the wave can be defined as the number of oscillations that occur in one second and can be expressed in hertz. The wavelength can be defined as the distance between the two adjacent points of a wave such as two crests or troughs.

The relationship between frequency (ν), speed of sound waves (V), and  wavelength (λ):

V = νλ

Given, the frequency of the sound wave, ν = 10 Hz

The speed of the sound wave,\(V = 340 m/s\)

The wavelength of the sound waves can determine as follows

λ = V/ν = 340/1020 = 0.333 m.

Therefore, the wavelength of the sound wave is 0.333 m

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The physical activity should an adult have each week is "60 minutes per day, 5 days a week". The correct answer is option C.

WHO stands for the World Health Organization. It is a specialized agency of the United Nations responsible for international public health. The WHO is headquartered in Geneva, Switzerland, and works in partnership with national governments and other organizations to promote health, keep the world safe, and serve the vulnerable. The organization's primary objective is to ensure that people can enjoy the highest possible level of health, regardless of their race, religion, or socioeconomic status. The WHO's work includes providing leadership on matters critical to health, setting norms and standards, promoting health research and evidence-based practice, and providing technical support to countries.

Here in the Question,

Option A, "60 minutes per day, 7 days a week," and option B, "30 minutes per day, 7 days a week," both suggest that physical activity should be performed every day of the week. While daily physical activity is beneficial for overall health and well-being, the WHO recommendation allows for two days of rest or lighter physical activity per week, which can help prevent injury and allow for recovery.

Option D, "30 minutes per day, 5 days a week," suggests a lower amount of physical activity than the WHO recommendation. While 30 minutes of moderate-intensity aerobic physical activity per day can provide some health benefits, it may not be enough to achieve significant improvements in cardiovascular health, muscular strength, and flexibility.

Therefore, Option C, "60 minutes per day, 5 days a week," is the correct answer as it aligns with the WHO recommendation for adults to engage in at least 150 minutes of moderate-intensity aerobic physical activity per week.

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Answer:

The weight of the box is 22.38 N.

Explanation:

The weight (W) of the mass is given by:

\( W = mg \)

Where:            

m: is the mass of the box = 6.0 kg

\(g_{m}\): is the acceleration due to gravity of mars

Since the acceleration due to the gravity of mars is 0.38 times that on Earth we have:

\(g_{m} = 0.38g_{E} = 0.38*9.81 m/s^{2} = 3.73 m/s^{2} \)

Hence, the weight of the mass is:

\( W = mg = 6.0 kg*3.73 m/s^{2} = 22.38 N \)

Therefore, the weight of the box is 22.38 N.

I hope it helps you!      

In Rutherford's famous set of experiments, the fact that some alpha particles were deflected at large angles indicated that the atom contains a dense, positively charged nucleus.

Rutherford conducted experiments where he bombarded a thin gold foil with alpha particles. According to the prevailing model at the time, the Thomson model, it was believed that the positive charge in an atom was spread uniformly throughout the atom, much like plum pudding.

However, Rutherford's observations revealed that some alpha particles experienced significant deflections and even bounced back at large angles. This unexpected result could not be explained by the Thomson model.

Rutherford proposed a new atomic model known as the nuclear model, suggesting that the atom consists of a tiny, dense, positively charged nucleus at the center and the majority of the atom is empty space. This explained the deflection of alpha particles, as they were repelled or deflected by the positive charge concentrated in the nucleus.

The deflection of alpha particles at large angles indicated the presence of a compact and positively charged nucleus within the atom, leading to a fundamental revision of the understanding of atomic structure.

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Take east to be the positive direction. Then the resultant force from adding F₁ and F₂ is

F₁ + F₂ = (-45 N) + 63 N = 18 N

which is positive, so it's directed east.

To this we add a third force F₃ such that the resultant is 12 N pointing west, making it negative, so that

18 N + F₃ = -12 N

F₃ = -30 N

So F₃ has a magnitude of 30 N and points west.

Answer:

first object final velocity =2m/s

second = 12m/s

Explanation:

i hope this will help you,..,

Answer:

Without food your not able to produce energy thats why you cannot work so long

Answer:

The term “INTERmolecular forces” is used to describe the forces of attraction. BETWEEN atoms, molecules, and ions when they are placed close to each other. •

Hope it helps

Mark me as Brainliest plz.

:DD

Answer: are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between atoms and other types of neighboring particles, e.g. atoms or ions.

Explanation:

True, some of the tiles in Byzantine mosaics were placed at an angle to reflect the light. This was done to enhance the visual appearance and create a dazzling effect.

Byzantine mosaics were used to decorate and embellish the walls, floors, and ceilings of buildings such as churches, palaces, and public places. They were made of small, colored, and shiny tiles called tesserae, which were arranged in various patterns to create intricate and sophisticated designs. One of the notable features of Byzantine mosaics was the use of tesserae at different angles to reflect the light and create a mesmerizing effect. The artists who created the mosaics were highly skilled and trained, and they knew how to use the properties of light to enhance their art. By placing the tiles at an angle, they could make the light bounce off the surface and produce a sparkling and radiant effect. The use of angles also allowed the artists to create depth, texture, and movement in their designs, which made them more dynamic and engaging. The Byzantine mosaics are still admired and revered for their beauty and craftsmanship, and they continue to inspire and influence artists and designers to this day.

In summary, some of the tiles in Byzantine mosaics were placed at an angle to reflect the light and create a dazzling effect. This technique was used by the artists to enhance the visual appearance and create depth, texture, and movement in their designs. The use of tesserae at different angles is one of the defining characteristics of Byzantine mosaics, and it reflects the skill and creativity of the artists who made them.

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Answer:

blc losing is part of life and u learn how do it again with losing and then you get up and comes to be a winner

Explanation:

Answer:

161.7N

Explanation:

Given parameters:

Mass of the box  = 55kg

Coefficient of friction  = 0.3

Applied force  = 140N

Unknown:

Frictional force on the box = ?

Solution:

The frictional force on the box is a force that opposes the motion of the box.

To find the value of this force;

        Fr  = u m g

u is the coefficient of static friction

m is the mass

g is the acceleration due to gravity

 So;

     Fr  = 0.3 x 55 x 9.8  = 161.7N

If the number of particles twice, the average kinetic energy of molecules in an ideal gas also doubles.

Energy is referred to by scientists as the capacity for work. People have figured out how to transform energy from one form to another and then use it to accomplish tasks, making modern civilization possible.

Everything we eat, drink, or use has energy. The inherent physiological processes of the body are fueled and controlled by energy. The more abrasive the environment, the more energy is required to maintain homeostasis, which is critical for cell and body tissue repair, muscle growth, and other functions.

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Answer:

 freezing melting sublimating  x y

 x and

Explanation:

To drop a table of states of matter the best headings must be

table name: matter state

    freezing melting sublimation x y

This order goes from the solid state to the gaseous state, which is obtained by introducing heat into the system

Answer: D on edge

X: Heat Is Absorbed

Y: Heat Is Released

Explanation:

sublimation and melting are both absorbing heat(aka getting warmer)as they change state while freezing and deposition are releasing heat(aka getting colder)as they change state

Answer:

14

Explanation:

the left top is protons

hope this helps :)

Based on the length of the spring and the mass of the block, the distance the 4.0 kg block can fall before a reversal in direction is 32 cm.

Because energy is conserved, the distance the block can drop can be found as:

Mass x gravity x distance = (1 / 2) x spring constant x distance ²

Spring constant:

= (Mass x gravity)  / distance

= (3 x 9.8) / 12

= 2.45 cm

Distance is:

Mass x gravity x distance = (1 / 2) x spring constant x distance ²

distance = (2 x Mass x gravity) / spring constant

= (2 x 4 x 9.8) / 2.45

= 32 cm

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Answer:D.Refractive Indez

Explanation:

It is usually expressed the other way: the ratio of the speed of light in a vacuum to the speed of light in a medium. In that case, it is called the "index of refraction".

You're going for "refractive index", but you've got the ratio flipped over.

the mass of the pill is 5 x 10^-3 g in scientific notation or 5 mg.

A pain-relieving pill has a mass of 0.005 g.

We need to express the pill's mass in grams using scientific notation or in milligrams.

1. In scientific notation:

0.005 g can be expressed in scientific notation as: 5 x 10^-3 g.2.

In milligrams:

1 g = 1000 mg.

Therefore, 0.005 g can be expressed in milligrams as:

0.005 g x 1000 mg/g = 5 mg.

Hence, the mass of the pill is 5 x 10^-3 g in scientific notation or 5 mg.

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If there is a decrease in the angle of inclination, the acceleration would decrease accordingly.

We know that the acceleration is the change in the velocity of the object with time. Given that the mass of the pulley remains the same and the puly is being moved up the incline as we can see.

We have to also recall that we have been told that the incline is frictionless and as a result we are not going to consider the frictional force. In any case, the force that moves the pully along the incline stull depends on the angle of inclination.

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.c ...energy

Explanation:

Amplitude does not affect wavelength. It also does not affect wave speed. Amplitude is the energy of the wave measured from the rest position to the top of the crest. A wave with more energy has a higher up crest/ higher amplitude.

As the amplitude of a mechanical wave increases, the quantity which increases is: C. energy.

A mechanical wave can be defined as a type of wave that requires a medium for its propagation and it creates a disturbance in the medium. Thus, a good example of mechanical wave is sound wave, which is typically transported in a perpendicular direction.

Amplitude refers to the maximum displacement of a wave when measured from its equilibrium position. Also, the amplitude of a mechanical wave has no effect on the following:

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The resistivity of the wire when a voltage of 115 V is applied across a wire that is 10 m long and has a 0.30 mm radius is: \(2.33 x 10-15 ohm-m\)

The resistivity of the wire can be determined from the magnitude of the current density. Using Ohm's law, the current density can be calculated as follows:
I = V/R
Where, I = current density (A/m2)
V = Voltage (V)
R = Resistance (ohms)

Therefore, the resistance of the wire can be determined as:
R = V/I
\(R = 115 V/1.4 x 108 A/m2\)
\(R = 8.21 x 10-9 ohms\)

The resistivity of the wire is equal to the resistance of the wire multiplied by the cross-sectional area of the wire, A. Since the wire has a radius of 0.30 mm, the cross-sectional area is equal to the area of a circle:

A = pi x r2
\(A = 3.14 x (0.30 x 10-3)2\)
\(A = 2.83 x 10-7 m2\)

Therefore, the resistivity of the wire can be determined as:

ρ = R x A
\(ρ = 8.21 x 10-9 x 2.83 x 10-7\)
\(ρ = 2.33 x 10-15 ohm-m\)

This is the resistivity of the wire when a voltage of 115 V is applied across a wire that is 10 m long and has a 0.30 mm radius.

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Outside horse ,On a merry-go-round, both inside and outside horses complete a round in the same amount of time. However, the outside horse has to cover a greater distance due to a larger circumference. Since speed is calculated by dividing distance by time, the outside horse has a higher speed in m/s compared to the inside horse.so ,correct option is b.

The horse on the outside near the outer rail moves faster in m/s on a merry-go-round. This is because the speed of each horse is determined by the distance it travels in a certain amount of time. The outside horse has to travel a larger distance in the same amount of time as the inside horse due to the larger circumference of the outer rail. Therefore, it has a higher speed than the inside horse. In a 100 words summary, the outside horse moves faster in m/s on a merry-go-round because it has to cover a larger distance in the same amount of time as compared to the inside horse due to the larger circumference of the outer rail. This results in a higher speed for the outside horse.

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Answer:

u breathe lol nice ok bro

Answer:

Answer 4, 11k/min

Explanation:

From 0 - 1 km, it took 12 minutes

From 1 - 2 km, it took 10 minutes.

10 + 12 = 22

Divide the time by 2 km. 22/2 = 11

The units used to measure specific heat capacity is Joules per kilogram per Kelvin.

It is the amount of heat absorbed per kilogram of material when the temperature rises by 1 kelvin.

Specific heat capacity C is the Joules of energy in form of heat per kilogram per Kelvin temperature. The units represented by

C = ___ J/kg.K

Thus, the units used to measure specific heat capacity is Joules per kilogram per Kelvin.

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Answer:

I think carbon dioxide is a mixuture and Methane is a compound

Explanation:

I believe friction is what it's called?

Answer:

1 mole of every substance has 6.022 × 10^23 particles. This is called Avagadro's constant