The rule stating that the sum of two emitted frequencies in an atomic spectrum equals a third frequency is attributed to the physicist
A) Niels Bohr.
B) Max Planck.
C) W. Ritz.
D) Einstein
Answer: C
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When looking at your own reflection in a plane mirror, you notice that you can’t see all of your body. So, in order to see a larger fraction of your body
A. Can do nothing about it with this mirror B. Need to raise or lower the mirror C. Need to get farther from the mirror D. Need to tilt the mirror E. Need to get closer to the mirror
Two identical charges, 2.0 m apart, exert forces of magnitude 4.0 N on each other. The value of either charge is:
A) 1.8 × 10-9 C B) 2.1 × 10-5 C C) 4.2 × 10-5 C D) 1.9 × 105 C E) 3.8 × 105 C
What do moonquakes reveal about the Moon?
A) It has a strong magnetic field generated by a large molten core. B) It has a differentiated core, displaced away from us by the Moon's rotation. C) Its small, partially molten core has been pulled toward us by tidal forces. D) The Moon has been geologically dead throughout its entire history. E) The Moon is quite active, almost as much so as Jupiter's moon Io.
Globular clusters are too small to have black holes at their center
Indicate whether the statement is true or false