The source of all wave motion is
A) a wave pattern.
B) a harmonic object.
C) something vibrating.
D) a region of variable high and low pressure.
E) none of the above
Answer: C
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A simple method of measuring the distance between the Earth and the Moon is to place in your line of sight to the Moon a
A) magnifying glass. B) coin. C) telescope. D) meterstick.
The stars ? Cygni and ? Cygni are in the constellation Cygnus. Which statement is true?
A) ? Cygni appears brighter. B) ? must be the eastern most star in the constellation. C) ? appears redder. D) ? is hotter. E) ? Cygni appears brighter.
A string attached to an airborne kite is maintained at an angle of 44.0° with the horizontal. If a total of 160 m of string is reeled in while bringing the kite back to the ground, what is the horizontal displacement of the kite in the process? (Assume the kite string doesn't sag.)
a. 111 m b. 80.0 m c. 31.7 m d. 115 m e. 155 m
X-Ray Diffraction: Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface. What angle does the beam make with the crystal planes for second order constructive?
A. 37° B. 40° C. 43° D. 46° E. 49°