The lower the frequency of a sound wave, the
A) lower its velocity.
B) greater its wavelength.
C) smaller its amplitude.
D) shorter its period.
E) greater its velocity.
B
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The speed of light in a certain medium is 2.2 x 108 m/s. What is the index of refraction of this medium?
A) 1.0 B) 1.2 C) 1.4 D) 1.6 E) 1.8
If hydrogen (H2) gas is the most common molecule found within the interstellar medium, then why do astronomers measure the amount of carbon monoxide (CO) gas to map molecular clouds?
What will be an ideal response?
A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
a.900 N b.450 N c.525 N d.1500 N
A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?
a. It is the same note since the same fret is being used. b. It is at higher frequency than the original note. c. It is at lower frequency than the original note. d. It can be either higher of lower frequency depending on whether the original note was above or below middle C.