Ch. 5 - Astronomy

Why is a sunflower yellow?

It reflects yellow light.

How are wavelength, frequency, and energy related for photons of light?

Longer wavelength means lower frequency and lower energy.

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?

The cloud is cool and lies between you and a hot star.

The Chandra X-ray Observatory must operate in space because

X-rays do not penetrate Earth's atmosphere.

Which of the following statements about X-rays and radio waves is not true?

X-rays travel through space faster than radio waves.

Radio waves are:

a form of light

Compared to red light, blue light has higher frequency and

higher energy and shorter wavelength.

Compared to an atom as a whole, an atomic nucleus:

is very tiny but has most of the mass.

The frequency of a wave is

measured in cycles per second, measured in hertz (Hz), equal to the speed of the wave divided by the wavelength of the wave, the number of peaks passing by any point each second.

From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?

radio, infrared, visible light, ultraviolet, X-rays, gamma rays

The wavelength of a wave is

the distance between two adjacent peaks of the wave.