Questions


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 x 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 x 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 x 10⁸ m/s. What is the substance?



6		A monochromatic light source used in a diffraction experiment has a wavelength of 4.60 x 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 x 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 x 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 (l 5 3.00 x 10^-7 m) than the energy of an average photon of sunlight (l 5 5.60 x 10^-7 m)?



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

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