Which of the following is true of the light emitted by the big bang gases?

A) It is detectable with infrared telescopes.
B) It can no longer be used to detect the big bang.
C) It is not detectable with radio telescopes.
D) It can be seen with the unaided eye.


A

Physics & Space Science

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If L represents angular momentum, I represents moment of inertia, p represents linear momentum, m represents mass, and r represents a distance, which of the following can represent kinetic energy?

a. p2/2m b. L2/2I c. rpI d. all of the above e. both (a) and (b)

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An optical fiber is made with core material of index of refraction 1.30 . The fiber is clad with a material of index 1.50 . What is the critical angle for this fiber?

a. 53.1° b. 56.4° c. 60.1° d. With these indices, there is not critical angle.

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What is hydrostatic pressure?

What will be an ideal response?

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