When an electron in H changes its spin from the same to the opposite direction as the proton, it:
A) emits an X-ray photon.
B) absorbs a radio wave photon.
C) emits a radio wave photon.
D) absorbs a visible light photon.
E) neither emits nor absorbs a photon.
C
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A force of 15.2N directed along the positive x-axis combines with a second force to produce a total force vector of magnitude 17.9N. What is the magnitude of the second vector?
A. 2.7N B. 9.5N C. 23.5N D. Not enough information is given.
TV remote controls use ________ radiation
Fill in the blank(s) with correct word
The name given to the point of a planet's orbit that is farthest from the Sun is
a. aphelion. b. focus. c. perihelion. d. solstice.
As a large reservoir behind a new dam fills with water, the water table in the vicinity of the reservoir
A) rises. B) falls. C) stays the same. D) becomes unsaturated.