Sound Properties Revision

The speed of sound through air is higher than that through water.

• True

• False

Sound intensity decreases when the source of sound touches an empty box.

• True

• False

The frequency of the sound wave, which propagates through air by a speed of 330 m/s and whose wavelength = 0.1 m, is ............................

• a. 330 KHz

• b. 3300 Hz

• c. 33 KHz

• d. 330 Hz

Using the following figures, compare from the point of view of sound intensity and pitch between

1. Sound wave (A) and sound wave (B)

• 1. The sound waves (A) and (B) have the same intensity, but the pitch of wave (A) is higher than that of (B).

• 1. The sound waves (A) more intensity than (B) but the pitch of wave (A) is higher than that of (B).

• 1. The sound waves (A) and (B) have the same intensity, but the pitch of wave (A) is lower than that of (B).

Using the following figures, compare from the point of view of sound intensity and pitch between

Sound wave (B) and sound wave (C)

• The intensity of sound wave (C) is higher than that of (B, but they have the same pitch.

• The intensity of sound wave (B) is higher than that of (C), but they have the same pitch.

• The intensity of sound wave (B) is lower than that of (C), but they have the same pitch.

Savart’s Wheel rotates with a rate of 300 cycles per minute, a sound of frequency 600 Hz is produced when an elastic plate touches the gear’s teeth. Calculate number of the gear’s teeth.

• 210 teeth

• 120 teeth

• 100 teeth

• 150 teeth

If the number of the gear’s teeth in Savart’s Wheel is30 teeth and it rotates 16 rotations per second.

Calculate:

a) The frequency of a produced tone by a kilohertz.

• 0.048 kHz

• 480 kHz

• 48 kHz

• 0.48 kHz

The sound quality is the property by which the ear can distinguish between strong and weak sounds.

• intensity

• quality

• pitch

The sound produced from the school bell is considered ...................... waves.

• a. longitudinal

• b. electromagnetic

• c. transverse

• d. no correct answer

Calculate the frequency of a tone produced by Savart’s Wheel in 100 s, if the no. of rotations multiplied by the number of teeth equals 28800.

• 388 Hz

• 208 Hz

• 280 Hz

• 288 Hz