Two wave pulses pass each other on a string. The one traveling toward the right has a positive amplitude, while the one traveling toward the left has an equal amplitude in the negative direction
At the point that they occupy the same region of space at the same time A)
constructive interference occurs.
B)
destructive interference occurs.
C)
a standing wave is produced.
D)
a traveling wave is produced.
E)
a wave pulse is produced.
B
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Consider the types of reference frames listed below. (NRF = nonrotating frame) A. A NRF in deep space B. A NRF that is freely floating C. A NRF attached to the earth’s center of mass D. A frame attached to the earth’s surface (or a similarly slowly rotating object) E. A frame moving at a constant velocity relative to one of the frame types described above F. A noninertial frame
Classify each of the frames listed below according to the type of frame it is according to the list above. (a) A NRF attached to Jupiter’s center of mass (b) A NRF attached to a satellite orbiting the earth (c) A frame attached to a car moving with a fixed speed on a straight road (d) A reference frame constructed in a sports stadium (e) A reference frame attached to a roller-coaster car (f) A reference frame attached to a freely falling elevator
When a ferromagnetic material that has been magnetized is brought to a temperature greater than the Curie temperature, what happens to its residual magnetism
a. Nothing happens to the residual magnetism. b. The residual magnetism disappears. c. The residual magnetism reaches it's highest value. d. All the magnetic domains causing magnetism become a single domain. e. The material of the magnet melts causing currents that are magnetic.
The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. If an electron at level 1 in a hydrogen atom absorbs 10.2 eV of energy, it moves to level 2. What typically happens next?
A) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. D) A different electron drops into level 1 because it is now unoccupied.
Observed temperature fluctuations in the Cosmic Microwave Background Radiation are:
A) millions of kelvins. B) hundreds of kelvins. C) a few kelvins. D) tens of millionths of a kelvin. E) immeasurably small.