Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Sound Waves

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Sound Waves

Sound is primarily transmitted in the forward direction when its...

Sound is primarily transmitted in the forward direction when its wavelength is significantly smaller than the speaker's diameter. Determine the frequency at which the sound's wavelength is one tenth of the diameter of a loudspeaker whose diameter is

20 \text{ cm}

. Assume the speed of sound is

340 \text{ m s}^{-1}

.

Options

A $3.4 \text{ kHz}$
B $1.7 \text{ kHz}$
C $170 \text{ kHz}$
D $17 \text{ kHz}$

Correct answer

D. $17 \text{ kHz}$

Step-by-step solution

Given diameter of the loudspeaker,

D = 20 \text{ cm} = 0.2 \text{ m}

Wavelength of the sound,

\lambda = \dfrac{D}{10} = 0.02 \text{ m}

Speed of sound,

v = 340 \text{ m s}^{-1}

Using the relation

v = f \lambda

, the frequency

f

is given by:

f = \dfrac{v}{\lambda}

f = \dfrac{340}{0.02} = 17000 \text{ Hz}

f = 17 \text{ kHz}

Practice Sound Waves on Quantrex Academy →

More from Sound Waves

A steel tube of length 1.00 m is struck at one end. A person with an ear close to the… Concepts Of Physics MCQ Edition [Volume 1]A man stands in front of a large wall at a distance of 50.0 m and claps his hands at… Concepts Of Physics MCQ Edition [Volume 1]Determine the minimum and maximum wavelengths of sound in water within the audible range… Concepts Of Physics MCQ Edition [Volume 1]A person is able to hear sound waves within the frequency range of 20 Hz to 20 kHz .… Concepts Of Physics MCQ Edition [Volume 1]Sound waves from a loudspeaker propagate nearly uniformly in all directions when the… Concepts Of Physics MCQ Edition [Volume 1]During a spiritual gathering, the devotees chant HARE-RAM HARE-RAM. The sound is… Concepts Of Physics MCQ Edition [Volume 1]A travelling sound wave is described by the equation y = 6.0 (600 t - 1.8 x) , with y… Concepts Of Physics MCQ Edition [Volume 1]A travelling sound wave is described by the equation y = 6.0 (600 t - 1.8 x) , with y… Concepts Of Physics MCQ Edition [Volume 1] Full Sound Waves list All Concepts Of Physics MCQ Edition [Volume 1] PYQs