The cosmic background radiation
a. has a blackbody spectrum.
b. has its peak emission in the microwave band.
c. corresponds to a blackbody at a temperature of 2.726 kelvins.
d. all of the above
d
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Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger linear displacement?
A) Child A B) Child B C) They have the same zero linear displacement. D) They have the same non-zero linear displacement. E) There is not enough information given to answer the question.
Why does Venus appear so bright to the eye?
A) It gets closer to us than any other planet does. B) Venus is closer to the Sun, so gets more intense sunlight. C) The planet's cloud-cover is highly reflective, reflecting 60% of the Sun's light. D) As seen from Earth, the disk of Venus can appear larger than any other planet's. E) All of the above are correct.
When one observes a scratch on the bottom of a block of clear plastic, the scratch appears to be 2.5 cm below the top surface as viewed from above. The actual thickness of the plastic block is 3.0 cm. The index of refraction of the block is ________.
Fill in the blank(s) with the appropriate word(s).
Iron is classified as a(n) ______________.
Fill in the blank(s) with the appropriate word(s).