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
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A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A) A) 1.7 mT B) 3.4 mT C) 0.85 mT D) 2.0 mT
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)
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.
What is hydrostatic pressure?
What will be an ideal response?