Sound wave

Sound is a ........ that propagates as an audible wave of pressure through a medium.

• vibration

• sensation

Loudness of sound is determined by the .......... of the sound wave.

• amplitude

• frequency

Answer explanation

• - LOUDNESS is determined by the magnitude of the wave.

• - PITCH is determined by the frequency of the wave.

BEAT can be defined as:

Superposition of 2 sound waves of ........................ that results in a wave of oscillating amplitude.

• equal amplitude and frequencies

• equal amplitude but slightly different frequencies

Standing wave is produced when two waves are travelling in ...... direction (same speed, frequency and amplitudes) are superposed.

• same

• opposite

For the case of a tube closed at one end, the 1st overtone has the frequency, f₁ equal to .........

• 3f₀

• 2f_o

• 1f₀

Answer explanation

For tube closed at one end, ONLY odd harmonic is obtained. Hence:

• - 1st overtone = f₁ = 3rd harmonic = 3f₀

Which of the following formula for determining the intensity of spherical sound wave is TRUE ?

The signs of v₀ and v_s is ........ if the motion of one is TOWARDS the other.

• negative

• positive