Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies.
B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero.
C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.
A
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Jupiter's bright zones are cloud streams made of ________ ice crystals
A) ammonia B) hydrogen C) methane D) water E) helium
Which mechanism(s) of heat transfer will work in a vacuum?
a. conduction b. convection c. radiation d. none of the above
An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R2 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is neither, since a lens cannot be made this way. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is a converging lens.
Light is a transverse wave
Indicate whether the statement is true or false