Tag: range of hearing

Questions Related to range of hearing

Which waves are used in sonography?

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

  1. Microwaves

  2. Infrared rays

  3. Radio waves

  4. Ultrasonic waves

Show answer
Correct Option: D
Explanation:

Ultrasonic waves are used in sonography for the mapping of body organs. The Ultrasonic waves that are sent inside the body are reflected from the different parts by creating the echo. They are more useful and less harmful than radiation.


A microwave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately) 

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

  1. $10^2$

  2. $10^4$

  3. $10^6$

  4. $10^8$

Show answer
Correct Option: C
Explanation:

Frequency of microwaves, $\upsilon _m \approx 10^{11}Hz$
Frequency of ultrasonic sound waves,$\upsilon _m \approx 10^5Hz$
$\therefore \, \dfrac{\upsilon _m}{\upsilon _u} = \dfrac{10^{11}}{10^{5}} = 10^6$

Which one of the following animals can hear infrasound?

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

  1. rhinoceros

  2. bat

  3. dog

  4. honey bee

Show answer
Correct Option: A
Explanation:

Answer is A.

Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos, can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.

Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?

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

  1. infrasonic sounds

  2. ultrasonic sounds

  3. audible sounds

  4. none of these

Show answer
Correct Option: A
Explanation:

Answer is A.

Earthquake produces infra-sound before the main shock wave.Infra-sound is a low-frequency sound. It is sound that is lower in frequency than 20 Hz (hertz) or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infra-sound, the sound pressure must be sufficiently high. 
Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos, can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.
Hence, we can see some animals get disturbed and start running here and there just before the earthquakes because they can hear infrasonic sound.

The frequency of a wave is $5\;Hz$. Then the wave is a/an (type of wave)

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

  1. ultrasonic wave

  2. microwaves wave

  3. infrasonics wave

  4. radio wave

Show answer
Correct Option: C
Explanation:

The waves below the frequency of 20 Hz are infrasonic waves. So the waves of 5 Hz is also an infrasonic wave.

Sounds having frequency more than 20,000 Hz are called -

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

  1. sonic sound

  2. ultrasonic sound

  3. infrasonic sound

  4. none of these

Show answer
Correct Option: B
Explanation:

Sounds having frequency more than 20,000 Hz are called Ultrasonic sound. As this is above the normal hearing range for humans, we cannot hear ultrasonic sound.

Which of the following frequency of sound can be heard by a dog but not by a man?

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

  1. 50,000 hertz

  2. 15,000 hertz

  3. 42000hertz

  4. none

Show answer
Correct Option: A
Explanation:

A sound of frequency 50,000 hertz can be heard by a dog but not by a man. The waves having frequency between 20Hz-20,000Hz are audible frequency of waves.

Why do we not hear the screams of a bat 

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

  1. screams are below 30,000Hz

  2. the screams are infra sonic

  3. the screams are ultra sonic

  4. all

Show answer
Correct Option: C
Explanation:

This is because the screams are ultra sonic(above 20,000 hertz) which human ear cannot hear.

Three different vibrating bodies produce three types of sounds X, Y and Z. Sounds X and Y cannot be heared by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in for monitoring nuclear reactor.The sound similar to that which is produced during an earthquake before the main shock wave is generated. What type of sounds are (i) X (ii) Y, and (iii) Z?

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

  1. X-infrasound

    Y-ultrasound

    Z- audible sound

  2. X-audible sound

    Y-infrasound

    Z-ultrasound

  3. X-ultrasound

    Y-infrasound

    Z-audible sound

  4. X-infrasound

    Y-audible sound

    Z-audible sound

Show answer
Correct Option: C
Explanation:

Ultrasound is used to see what is happening in a nuclear reactor.Ultrasounds and infra sounds are not audible to man.ultrasound have frequency more than
20kHz. Infrasound have frequency below 20Hz

Elephants communicate with

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

  1. Sonic sound

  2. Infrasonic sound

  3. Ultrasonic sound

  4. None of these

Show answer
Correct Option: B
Explanation:

Elephants can communicate using very low frequency sounds, with pitches below the range of human hearing. These low frequency sounds, termed infrasonic sounds, can travel several kilometers, and provide elephants with a private communication channel that plays an important role in elephants complex social life. Their frequencies are as low as the lowest notes of a pipe organ.