Astronomy

The speed of light in a vacuum is:

300,000 km/s

What wavelengths of light can the human eye see?

380 nm to 750 nm

Light with a wavelength of 600 nm has a frequency of:

5 x 1014 Hz

Which formula denotes how the speed of light c is related to its wavelength λ and frequency f?

c = lf

An emission line is produced when an atom absorbs a photon of a specific energy. T/F

false

Which of the following lists different types of electromagnetic radiation in order from the smallest wavelength to the largest wavelength?

gamma rays, ultraviolet, visible, infrared, radio waves

A radio photon travels slower than a gamma ray photon. T/F

False

A thin cloud of cool gas on top of a hotter blackbody will radiate an emission spectrum. T/F

False

The period of a wave is inversely proportional to the frequency of that wave. T/F

True

How does the speed of light traveling through a medium (such as air or glass) compare to the speed of light in a vacuum?

It is always less than the speed of light in a vacuum.

How do the wavelength and frequency of red light compare to the wavelength and frequency of blue light?

Red light has a longer wavelength and lower frequency than blue light.

If the wavelength of a beam of light were to double, how would that affect its frequency?

The frequency would be two times smaller

What is the difference between visible light and X-rays?

Wavelength; X-rays have a shorter wavelength than visible light.

If you observe an isolated hot cloud of gas, you will see:

an emission spectrum

If the frequency of a beam of light were to increase, its period would _________ and its wavelength would _________?

decrease; decrease

As wavelength increases, the energy of a photon _________ and its frequency _________.

decreases; decreases

The color of visible light is determined by its

wavelength