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Parallel Exercises B
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1

(a) What is the speed of light while traveling through a vacuum? (b) while traveling through air at 30°C? (c) while traveling through air at 0°C?
2

How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 × 105 km?
3

How many minutes are required for a radio signal to travel from Earth to a space station on Mars if the planet Mars is 7.83 × 107 km from Earth?
4

An incident light ray strikes a mirror with an angle of 30° to the surface of the mirror. What is the angle of the reflected ray?
5

The speed of light through a transparent substance is 2.00 × 108 m/s. What is the substance?
6

A monochromatic light source used in a diffraction experiment has a wavelength of 4.60 × 10-7 m. What is the energy of a photon of this light?
7

In black-and-white photography, a photon energy of about 4.00 × 10-19 J is needed to bring about the changes in the silver compounds used in the film. Explain why a red light used in a darkroom does not affect the film during developing.
8

The wavelength of light from a monochromatic source is measured to be 6.80 × 10-7 m. (a) What is the frequency of this light? (b) What color would you observe?
9

How much greater is the energy of a photon of ultraviolet radiation (λ = 3.00 × 10-7 m) than the energy of an average photon of sunlight (λ = 5.60 × 10-7 m)?
10

At what rate must electrons in a wire vibrate to emit microwaves with a wavelength of 1.00 mm?
11

What is the speed of light in ice?
12

What is the frequency of a monochromatic light used in a diffraction experiment that has a wavelength of 4.60 × 10-7 m?
13

What is the energy of a photon of red light with a frequency of 4.3 × 1014 Hz?
14

What is the energy of a photon of ultraviolet radiation with a wavelength of 3.00 × 10-7 m?
15

At a particular location and time, sunlight is measured on a onesquare- meter solar collector with an intensity of 500.0 watts. If the peak intensity of this sunlight has a wavelength of 5.60 × 10-7 m, how many photons are arriving each second?







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