Tag: range of hearing

Questions Related to range of hearing

Which one has higher frequency?

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. Infrasonic sound

  2. Ultrasonic sound

  3. Audible sound

  4. All of the above have same frequency

Show answer
Correct Option: B
Explanation:

Ultrasonic frequency is above audible range means above $20KHz$ and infrasonic frequency is below the audible range which means below $20 Hz$.

so the answer is B

The property of ultrasonic waves used in manufacturing emulsion for photographic films is its, _____________

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. High speed

  2. High frequency

  3. Higher wavelength

  4. High amplitude

Show answer
Correct Option: B
Explanation:

The property of ultrasonic waves in manufacturing emulsion for photographic films in its high frequency. The frequency of ultrasonic wave is above $20 KHz$

The grandparents and parents of two-year old girl are playing with her in a room. A sound source produces a $28 kHz$ sound. Who in the room is most likely to hear the sound?

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. Grandparent

  2.  Little girl

  3. Both

  4. None of them

Show answer
Correct Option: B
Explanation:
The frequency range of hearing in infants is more than in adult. As the infant gets mature, this range decreases. So two year girl will be more likely to hear that sound.
So the answer is B.

The audible range in humans is ____________.

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. $20 Hz$ to $2000 Hz$

  2. $200 Hz$ to $20,000 Hz$

  3. $20 Hz$ to $20,000 Hz$

  4. $200 Hz$ to $20 kHz$

Show answer
Correct Option: C
Explanation:

the audible range of human ear is $20Hz - 20000Hz$

so the answer is C

Ultrasonic waves.

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. Have a crushing and penetrating power

  2. Bring about biological effect such as maiming a frog

  3. Influence chemical reactions

  4. All the above

Show answer
Correct Option: D

The range of the wavelength of audible sound that travels with a velocity of 330 m s$^{-1}$ at 0$^{\circ}$ C is 16.5 m - 16.5 mm.

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

$\displaystyle \lambda = \left ( \frac{330}{20} m - \frac{330}{20 \times 10^3} m \right )$
$=(16.5m - 16.5 mm)$

The sound intensity is 0.008 $W/m^2$ at a distance of 10 m from an isotropic point source of power of the source is approximately :

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. 2.5 watt

  2. 0.8 watt

  3. 8 watt

  4. 10 watt

Show answer
Correct Option: D

A train running at 108 km/hr towards east whistles at a frequency of 800 Hz. The frequencies heard by a passenger sitting in the train and a person standing near the track whom the train has just passed (Speed of Sound = 330 m/s) 

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. 800 Hz, 733 Hz

  2. 740 Hz, 800 Hz

  3. 800 Hz, 880 Hz

  4. 800 Hz, 750 Hz

Show answer
Correct Option: B

The driver of a car travelling at the speed of $30m/sec$ towards a hill sounds a horn of frequency $600\ Hz$. If the velocity of sound in air is $330m/s$, the frequency of reflected sound as heard by the driver is

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. $500\ Hz$

  2. $550\ Hz$

  3. $555.5\ Hz$

  4. $720\ Hz$

Show answer
Correct Option: D

Ultrasonic, intrasonic and audible waves travel through a medium with speeds $V _u,V _i,$ and $V _a$ respectively, then (given constant temperature)

physics range of hearing sound: production of sound audible, infrasonic and ultrasonic sounds different sounds

  1. $V _i=V _a=V _u$

  2. $V _u>V _a>V _i$

  3. $V _u < V _a < V _i $

  4. ${ V } _{ a }\le { V } _{ u }={ V } _{ i }$

Show answer
Correct Option: A