Time Dilation: A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip.(a) How long did the trip take according to an observer on Earth?(b) How long did the trip take according to an observer on the spaceship?
What will be an ideal response?
(a) 9.0 light-years (b) 7.8 years
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Molecular Rotation: A diatomic molecule has 18 × 10-5 eV of rotational energy in the L = 2 quantum state. What is its rotational energy in the L = 0 quantum state? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 9.0 × 10-5 eV B. 6.0 × 10-5 eV C. 3.0 × 10-5 eV D. 0 eV
As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame
, will A) decrease. B) remain unchanged. C) increase. D) increase at first but start to decrease when the speed of the reference frame equals half the speed of light. E) decrease at first but start to increase when the speed of the reference frame equals half the speed of light.
During an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much heat is added to the gas during this process?
A) 50 J B) 25 J C) -50 J D) -25 J E) 0 J
Twenty milliseconds is 0.020 s
Indicate whether the statement is true or false