ASTR MIDTERN 2

Why does a red sweater appear red?

• The sweater is absorbing red light.

• The sweater is transmitting red light.

• The sweater is reflecting red light.

• The sweater is reflecting all colors except red.

What is light?

• a wave, like sound only much faster

• a particle

• the absence of dark

• a kind of energy with some of the properties of waves and some properties of particles

• the sensation you feel when hit by energy, visible or invisible

Compared to red light, blue light has

• shorter wavelengths and lower energy.

• longer wavelengths and lower energy.

• shorter wavelength and higher energy.

• longer wavelength and higher energy.

Which of the following lists the different kinds of light in order from shortest to longest wavelength?

• gamma rays, x-rays, ultraviolet, visible, infrared, radio

• visible light, ultraviolet, infrared, radio, x-rays, gamma rays

• x-rays, ultraviolet, visible, infrared, radio, gamma rays

• ultraviolet, visible light, infrared, gamma rays, x-rays

Which travels fastest?

• x-rays

• ultraviolet light

• visible light

• radio waves

• They all travel at the same speed.

Which carries the most energy per photon?

• gamma rays

• x-rays

• ultraviolet light

• visible light

• radio waves

What happens to thermal radiation (a continuous spectrum) if you make the source hotter?

• It produces more energy at all wavelengths and the peak of the spectrum shifts to shorter wavelengths.

• It produces more energy at all wavelengths and the peak of the spectrum shifts to longer wavelengths.

• It produces less energy at all wavelengths and the peak of the spectrum shifts to shorter wavelengths.

• It produces less energy at all wavelengths and the peak of the spectrum shifts to longer wavelengths.

What is found in the nucleus of a Helium atom?

• protons with a positive charge and neutrons with a neutral charge

• protons with a positive charge, neutrons with a neutral charge and electrons with a negative charge

• electrons with a negative charge

• neutrons with a positive charge and electrons with a negative charge

What does the 12 in "carbon twelve" mean?

• This is the twelfth element in the periodic table.

• The atom has 12 protons in its nucleus.

• The sum of the number of protons and neutrons in its nucleus is 12.

• The sum of protons and electrons is 12.

How is the isotope 14C different from 12C?

• It has more protons.

• It has more neutrons.

• It has more electrons.

• It is a different element.