What is meant by spectral resolution?
A) It is a measure of how much energy an object emits in different parts of the electromagnetic spectrum.
B) It is a measure of how close two spectral lines can be distinguished.
C) It is a measure of how close two point sources can be distinguished.
D) It is the same as angular resolution when applied to telescopes operating at different wavelengths.
B
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If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B. b. Galaxy A is four times further away than Galaxy B. c. Galaxy A is twice as distant than Galaxy B. d. Galaxy A is twice as close than Galaxy B.
A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward. E) none of the above
In each cycle an engine gets 50. J from the combustion of fuel and it expels 45. J of heat to the environment at 13.°C. What is the minimum possible temperature at which the 50. J could be taken in?
A) 45°C B) 33°C C) 20°C D) 27°C E) 23°C
A 1.2-m high by 2.8-m wide vertical rectangular gate is used to control the flow of water from a reservoir to a grinding mill. A frictionless hinge runs along the bottom of the gate. The minimum force acting normal to and at the very top of the gate needed to hold the gate shut if the water is at the very top of the gate is nearest:
(A) 6590 N (B) 9800 N (C) 10 000 N (D) 13 300 N