Summary

• Mass on a spring
• Pendulums
• Energy and oscillations
• Simple harmonic motion

---

Chapter 16

---



• Waves
• wavelength, frequency & speed
  oscillations & waves applet
  wave parameters applet
Example #1
Example #2


• transverse & longitudinal
• energy transport
  






• Wave properties
• amplitude
• frequency
• wavelength
• propagation speed
• wave function

• transverse speed
• PhET wave applet
Example #3
Example #4
Example #5




• The wave equation
Example #6
Example #7





• String waves
• demo
• speed equation
Example #8

kw4
A sound wave travels through wood into aluminum, a stiffer medium than wood. The wave speed in aluminum will be ____ than the speed in wood.
A. higher
B. the same as
C. lower
Answer



















kw4
If the frequency of a periodic wave is doubled while the velocity remains the same, what happens to the wavelength?
A. It is cut to one fourth.
B. It is cut in half.
C. It stays the same.
D. It doubles.
Answer



















PoP5 qq13.2mod
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the transverse speed
A. increases
B. decreases
C. stays the same
Answer



















PoP5 qq13.2a
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the wave propagation speed
A. increases
B. decreases
C. stays the same
Answer



















PoP5 qq13.2b
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the wavelength
A. increases
B. decreases
C. stays the same
Answer



















pse6 16.3
A wave moving along the x-axis is described by
y(x,t) = 5.00e^{−(x + 5.00t)²}
Determine the direction of motion.
A. +x direction
B. −x direction
C. not moving
Answer



















pse6 16.3
A wave moving along the x-axis is described by
y(x,t) = 5.00e^{−(x + 5.00t)²}
Determine the wave speed.
A. 5.00 m/s
B. 6.74 mm/s
C. 10.0 m/s
D. 0 m/s
Answer



















PoP5 13.19
Transverse waves travel at 20.0 m/s in a string under a tension of 6.00 N. What tension is required for a wave speed of 30.0 m/s in the same string?
A. 2.67 N
B. 4.00 N
C. 9.00 N
D. 13.5 N
Answer



















klm
A sound wave travels through wood into aluminum, a stiffer medium than wood. Is the reflected wave in the wood inverted?
A. Yes
B. No
C. Can't say
Answer



















PoP5 13.24
What power must be supplied to a taut rope of mass 0.180 kg and length 3.60 m in order to generate sinusoidal waves of amplitude 0.100 m, wavelength 0.500 m, and speed 30.0 m/s? A. 427 kW
B. 18.8 kW
C. 1.07 kW
D. 28.3 W
Answer







































answer

A. higher
A stiffer medium (larger spring constants) means faster oscillations and faster wave propagation.



















answer

B. It is cut in half.




















answer

A. increases




















answer

C. stays the same
The wave propagation speed depends only upon the properties of the medium.



















answer

B. decreases




















answer

B. −x direction
The positive sign in front of vt in the expression indicates the wave travels in the negative x direction.



















answer

A. 5.00 m/s
The number in front of t in the expression is the wave speed in meters per second.



















answer

D. 13.5 N




















answer

B. No
A wave does not invert when it reflects from a boundary where it is going from a slow medium (wood) into a fast medium (aluminum).



















answer

C. 1.07 kW