Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4
b. 2
c. 1
d. 3
e. 0 (no beats are produced)
b
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Most of the time, planets are observed to
A) be stationary with respect to background stars B) move eastward with respect to background stars C) move due south with respect to background stars D) move westward with respect to background stars
When a metal plate with a hole in it is cooled, the size of the hole becomes
1) smaller, 2) larger, 3) remains the same size, and when the plate is heated, the hole becomes 4) smaller. 5) larger. 6) remains the same size.
What is Hawking radiation?
A) a hypothesized way for black holes to gradually shrink in mass B) a type of high-energy radiation that comes from inside a black hole's event horizon C) a type of radiation coming from objects supported by degeneracy pressure D) a type of radiation that we have detected so far only with infrared telescopes in space
A very long straight wire carrying 2.0 A lies along the x-axis. A second very long parallel wire carrying 3.0 A in the same direction is positioned parallel to the x-axis and passes through the point (0, 1.0 m)
What is the magnitude of the magnetic field at the point (0, 0, 1.0 m)?