The Sun's high-speed charged nuclei and electrons form a fourth phase of matter known as a
a. neutrino.
b. sunspot.
c. plasma.
d. fusion pool.
[Ques. 2] A quantum is a
a. discrete amount.
b. fundamental property.
c. unit of momentum.
d. proton.
[Ques. 3] You can raise the temperature of an object with
a. microwaves.
b. infrared waves.
c. ultraviolet rays.
d. all of the above.
e. only (a) and (b) above.
[Ques. 4] What is the name of the Sun's outermost solar atmosphere, which can be seen during a solar eclipse?
a. Solar wind
b. Heliosphere
c. Photosphere
d. Corona
[Ques. 5] Which of these colors of light has photons of lowest energy?
a. Yellow
b. Green
c. Blue
d. Violet
[Ques. 6] At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
a. the speed of radio waves.
b. the speed of light.
c. the speed of gamma rays.
d. all of the above.
e. only (a) and (b) above.
[Ques. 7] The sunspot cycle has a period of
a. 19 years.
b. 11 years.
c. 38 years.
d. 24 years.
[Ques. 8] Which of these colors of light has photons of lowest energy?
a. Blue
b. Green
c. Yellow
d. Violet
[Ques. 9] Magnetic fields are produced by
a. constant electric currents.
b. electric currents that vary sinusoidally with time.
c. time-varying electric fields.
d. all of the above.
e. only (a) and (b) above.
[Ques. 10] The Sun is a
a. moon.
b. galaxy.
c. planet.
d. star.
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