Unit 10 Extra
Either print this page and complete or
(better yet) neatly show your answers on a separate page of paper.
All answers must be expressed as complete sentences and/or all work
shown to receive credit
- When a wave reaches the boundary of a new medium, part of the
wave is reflected and part is transmitted. What determines the
amount of reflection?
- When a wave crosses a boundary between thin and thick rope,
its wavelength and velocity change, but its frequency does not.
Explain why the frequency is constant.
- Joe makes a single pulse on a stretched spring. How much
energy is required to make a pulse with twice the amplitude?
- The Sears Building in Chicago sways back and forth with a
frequency of about 0.10 Hz. What is its period of vibration?
- An ocean wave has length of 10.0 m. A wave passes a fixed
location every 2.0 s. What is the speed of the wave?
- A group of swimmers is resting in the sun on an off-shore
raft. They estimate that 3.0 m separates a trough and an adjacent
crest of surface waves on the lake. They count 14 crests that pass
by the raft in 20 s. How fast are the waves moving?
- AM radio signals are broadcast at frequencies between 550 kHz
and 1600 kHz (kilohertz) and travel 3.0 X 10^8 m/s.
a. What is the range of wavelengths for these signals?
b. FM frequencies range between 88 MHz and 108 Mhz (megahertz)
and travel the same speed. What is the range of FM wavelengths?
- The speed of sound in water in 1498 m/s. A sonar signal is
sent from a ship at a point just below the water surface and 1.80
s later the reflected signal is detected. How deep is the ocean
beneath the ship?
- The velocity of the transverse waves produced by an earthquake
is 8.9 km/s, while that of the longitudinal waves is 5.1 km/s. A
seismograph records the arrival of the transverse waves 73 s
before that of the longitudinal waves. How far away was the
- The time needed for a water wave to change from the
equilibrium level to the crest is 0.18 s.
a. What fraction of a wavelength is this?
b. What is the period of the wave?
c. What is the frequency of the wave?
- If you slosh the water back and forth in a bathtub at the
correct frequency, the water rises first at one end and then at
the other. Suppose you can make a standing wave in a 150-cm long
tub with a frequency of 0.3 Hz. What is the velocity of the water
Resources for physics students are available through
links on the
Physics Home Page. Such resources include the
Physics Studios (a collection of animations and movies which
illustrate key physics concepts) and
Physics Classroom (an online tutorial written in an
This page created by Suzanne
South High School.
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