Which of these forms of radiation passes most easily through the disk of the Milky Way?
A. red light
B. blue light
C. infrared light
Ans: C. infrared light
You might also like to view...
The celestial sphere is
A) the central spherical region of the Milky Way Galaxy, dense with stars. B) a spherical galaxy, centered on the Sun. C) a useful illusion used to map the stars and other objects in the sky. D) the star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars. E) another name for our spherical Sun.
We have a hollow metallic sphere with charge ?5.20 µC and radius 5.40 cm. We insert a +10.4-µC charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
a. +5.20 µC b. +15.6 µC c. –5.20 µC d. –15.6 µC e. –10.4 µC
A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 60 kg mass is
A. 88 m/s. B. 67 m/s. C. 51 m/s. D. 40 m/s. E. 24 m/s.
Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley