A star is said to be born when __________.

• a protostar reaches a temperature high enough for nuclear fusion to begin

• a red giant collapses on itself and becomes a black hole

• pressure within a protostar becomes so great that a supernova occurs

• a dark, cool interstellar cloud begins to contract

Another name for the interstellar matter that will eventually form a star is ______.

• Supernova

• Red giant

• Black hole

• Nebula

The source of the sun’s energy is ______.

• Nuclear fission

• Nuclear fusion

• Photosynthesis

• None of the above

In the first step of nuclear fusion reaction __________ is converted _________.

• Hydrogen, helium

• Hydrogen, nitrogen

• Helium, hydrogen

• Nickel, iron

Gamma rays, X-rays, visible light, and radio waves are all types of ________.

• Nuclear energy

• Chromatic aberration

• Ultraviolet radiation

• Electromagnetic radiation

In which list are the forms of electromagnetic energy arranged in order from longest to shortest wavelengths?

• Gamma rays, x rays, ultraviolet rays, visible light

• Radio waves, infrared rays, visible light, ultraviolet rays

• X rays, infrared rays, blue light, gamma rays

• Infrared rays, radio waves, blue light, red light

Which color has the longest wavelength and therefore the lowest energy?

• Red

• Blue

• Green

• Orange

The wavelength of electromagnetic radiation with the greatest energy is ______.

• Gamma rays

• X-rays

• Visible light

• Microwaves

What information does a star’s spectrum offer about the star?

• Size

• Elements and chemical composition

• Age

• None of the above

Which of the following refers to the apparent change in wavelength that occurs when an object moves toward or away from a source?

• Doppler effect

• Chromatic aberration

• Spectroscopy

• Wave theory of light