Superpotition Wave : Stationary Wave

A stationary sound wave has a series of nodes. The distance between the first and the sixth node is 30.0 cm. What is the wavelength of the sound wave?

• 5.0 cm

• 6.0 cm

• 10.0 cm

• 12.0 cm

The diagram represents a stationary wave on a stretched string

• A

• B

• C

• D

A stationary wave of frequency 80.0Hz is set up on a stretched string of length 210 cm. What is the speed of the waves that produce this stationary wave?

• 56.0 m/s

• 112 m/s

• 5600 m/s

• 11200 m/s

The diagram shows a steel wire clamped at one end and tensioned at the other by a weight hung over a pulley. A vibration generator is attached to the wire near the clamped end. A stationary wave with one loop is produced. The frequency of the vibration generator is f. Which frequency should be used to produce a stationary wave with two loops?

• 4f

• 2f

• f/2

• f/4

The basic principle of note production in a horn is to set up a stationary wave in an air column. For the lowest note produced by a horn, a node is formed at the mouthpiece and the antinode is formed at the bell. The frequency of this note is 75Hz. What are the frequencies of the next two higher notes for this air column?

• first higher note = 113 Hz

  second higher note = 150 Hz

• first higher note = 150 Hz

  second higher note = 225 Hz

• first higher note = 150 Hz

  second higher note = 300 Hz

• first higher note = 225 Hz

  second higher note = 375 Hz

ravelling waves of wavelength 20 cm are created in the air columns in a closed pipe P and an open pipe Q. The lengths of the pipes are shown.

In which pipe or pipes are stationary waves formed?

• P and Q

• P only

• Q only

• neither P nor Q

A musical organ produces notes by blowing air into a set of pipes that are open at one end and closed at the other. What is the second lowest frequency of sound produced by a pipe of length 10m? (The speed of sound in the pipe is 320ms^–1.)

• 16 Hz

• 32 Hz

• 64 Hz

• 96 Hz

A horizontal glass tube, closed at one end, has a layer of dust laid inside it on its lower side. Sound is emitted from a loudspeaker that is placed near the open end of the tube. The frequency of the sound is varied and, at one frequency, a stationary wave is formed inside the tube so that the dust forms small heaps. The distance between four heaps of dust is 30 cm.

The speed of sound in the tube is 330ms^–1. What is the frequency of the sound emitted by the loudspeaker?

• 1650 Hz

• 2200 Hz

• 3300 Hz

• 6600 Hz

A stationary sound wave is formed in a measuring cylinder by blowing across the top, as shown. Which statement is correct?

• The fundamental frequency of the stationary wave decreases when some water is added to the cylinder

• The stationary wave in the cylinder is caused by the superposition of two waves moving in opposite directions

• The stationary wave in the cylinder is polarised

• The stationary wave will have an antinode at the bottom of the cylinder

The sound from a loudspeaker placed above a tube causes resonance of the air in the tube. A stationary wave is formed with two nodes and two antinodes as shown. The speed of sound in air is 330 ms^–1 . What is the frequency of the sound?

• 413 Hz

• 550 Hz

• 830 Hz

• 1650 Hz