Physics, 01.02.2020 23:42 dondre54

Compared with the peak wavelength given off by the sun, what is the peak wavelength given off by a hotter star?
a. shorter in wavelength and higher in energy
b. shorter in wavelength and lower in energy
c. longer in wavelength and higher in energy
d. longer in wavelength and lower in energy

Answers: 2

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Answer from: RealStephani

A. Shorter in wavelength and higher in energy

Explanation:

The peak wavelength of a star can be found by using Wien's displacement law:

$\lambda=\frac{b}{T}$

where

b is the Wien's displacement constant

T is the surface temperature of the star

From the equation, we see that the peak wavelength $\lambda$ is inversely proportional to the temperature: therefore, a star which is hotter then the sun (greater T) will have shorter wavelength.

Moreover, the energy of the emitted radiation is inversely proportional to the wavelength:

$E=\frac{hc}{\lambda}$

where h is the Planck constant, c is the speed of light. Therefore, shorter wavelength means higher energy.

So, the correct answer is

A. Shorter in wavelength and higher in energy

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

can u provide the graph and if its not possible

then i can tell u the segment where the

average time interval starts degrading is the segment where the car is slowing down

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