What is the magnitude of the energy difference between the lowest energy of a hydrogen atom (n = 1 ) and the second excited state (n = 3)?
A)
27.4 eV
B)
9.07 eV
C)
1.51 eV
D)
109 eV
E)
12.1 eV
E
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A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).
The Moon's average distance from Earth is about ______________ km
Fill in the blank(s) with correct word
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?
Aberration: Chromatic aberration in lenses is due to the
A. reflection of light by the lens. B. refraction of light by the lens. C. dispersion of light by the lens. D. polarization of light by the lens. E. None of the other choices is correct.