FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 15: Wave Motion

Show Answer

Share

---

All types

Filters

Study Flashcards

Question 21

Multiple Choice

Review LaterAdd Note

Review Later

The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m^-1) x - (7.22 s^-1) t]. What is the speed of the wave?

A) 0.450 m/s
B) 1.41 m/s
C) 2.22 m/s
D) 3.16 m/s
E) 23.5 m/s

F) D) and E)
G) A) and D)

Correct Answer

verified

Show Answer

Question 22

Multiple Choice

Review LaterAdd Note

Review Later

An earthquake generates three kinds of waves: surface waves (L-waves) , which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the fastest. People do not generally feel the P waves, but animals seem to be sensitive to them. Take the density of the material through which these waves travel to be 2.0 × 10³ kg/m³, the Young's modulus to be 9.8 × 10¹⁰ N/m², and the shear modulus to be 3.2 × 10¹⁰ N/m². A person reports that her dog started barking 30 seconds "before the earthquake." Approximately how far away was the origin of the earthquake?

A) 180 km
B) 280 km
C) 140 km
D) 90 km
E) 360 km

F) B) and C)
G) None of the above

Correct Answer

verified

Show Answer

Question 23

True/False

Review LaterAdd Note

The velocity of a transverse wave on a stretched string or cord depends only on the tension in the cord.

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves have the same period?

The speed of waves on a thin wire is 150 m/s. The density of the material that the wire is made of is 5000 kg/m³. The wire has a 0.500 mm diameter circular crosssection. What is the tension that the wire is under?

A small town has decided to forego the use of electrical power and send energy through town via mechanical waves on ropes. They use rope with a mass per length of 1.50 kg/m under 6000 N tension. If they are limited to a wave amplitude of 0.500 m, what must be the frequency of waves necessary to transmit power at the average rate of 2.00 kW?

Describe the phenomenon known as refraction

The energy transported by a wave is proportional to the amplitude of the wave.

Which of the following is a solution to the wave equation:

Periodic waves with a period of 0.026 s travel along a rod at 1200 m/s. What is the wave number k of the waves?

At a location that is 3.00 m from wave source A and 4.20 m from wave source B, destructive interference occurs. Source A and source B are coherent and in phase. What is the maximum wavelength of the waves?

FIGURE 15-1 -In Fig. 15-1, the wavelength is

Two waves travel simultaneously through the same medium. The first wave is described by y₁(x,t) = (2.00 cm) cos[kx-ωt] and the second wave by y₂(x,t) = (3.00 cm) sin(kx-ωt) . What is the amplitude of the resulting wave?

State the principle of superposition.

Describe the phenomenon known as diffraction.

Two wave pulses pass each other on a string. The one traveling toward the right has a positive amplitude, while the one traveling toward the left has an equal amplitude in the negative direction. At the point that they occupy the same region of space at the same time

FIGURE 15-2 -A harmonic wave has a wavelength of 2.0 m and a frequency of 5.0 Hz. What is the speed of the wave?

What is the period of a wave described by the following function? y(x,t) = (2.00 m) cos[(6.00 m^-1) x + (10.00 s^-1) t] + (2.00 m) cos[(3.00 m^-1) x + (5.00 s^-1) t]

The velocity of a longitudinal wave traveling in a liquid or a gas depends only on the density of the fluid.

A wave has a period 2.00 s, an amplitude 20.0 cm, and a wavelength 3.00 m. What is the speed of the wave?