standing waves- Open pipe/string

Sketch A shows two identical pulses traveling in opposite directions along a string, each with a speed of 1.0 cm/s. After 4.0 s, the string will look like which of the other sketches?

• 1

• 2

• 3

• 4

• 5

The figure represents a string of length L, fixed at both ends, vibrating in several harmonics. Which string shows the 4th harmonic?

• A

• B

• C

• D

• E

The figure represents a string of length L, fixed at both ends, vibrating in several harmonics. Which string shows the 3rd harmonic?

• A

• B

• C

• D

• E

The figure shows several modes of vibration of a string fixed at both ends. The mode of vibration that represents the fifth harmonic is

• 1

• 2

• 3

• 4

• None of these is correct.

Of the sound sources shown, that which is vibrating with its first harmonic is

• the whistle.

• the organ pipe.

• the vibrating string.

• the vibrating rod.

• None of these.

On a standing-wave pattern, the distance between two consecutive nodes is d. The wavelength is

• d/2

• d

• 3/2d

• 2d

• 4d

A 1.00 m string fixed at both ends vibrates in its fundamental mode at 440 Hz. What is the speed of the waves on this string?

• 220 m/s

• 440 m/s

• 660 m/s

• 880 m/s

• 1.10 km/s

One end of a long spring is attached to a wall. A student vibrates the other end of the spring vertically, creating a wave that moves to the wall and reflects back toward the student, resulting in a standing wave in the spring, as represented below.

What is the phase difference between the incident wave and the reflected wave at point P?

• 0^o

• 90^o

• 180^o

• 270^o

An open pipe of length 50.0 m has standing waves formed in it. The speed of sound in air is 350 m/s. What is the fundamental frequency of the waves?

• 1/7 Hz

• 2/7 Hz

• 7/2 Hz

• 7 Hz

How many nodes are there on this standing wave?

• 1

• 1.5

• 3

• 4