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

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

  1. infrasonic sounds

  2. ultrasonic sounds

  3. audible sounds

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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

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

Elephants communicate with

  1. Sonic sound

  2. Infrasonic sound

  3. Ultrasonic sound

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. High speed

  2. High frequency

  3. Higher wavelength

  4. High amplitude
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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?

  1. Grandparent

  2. Little girl

  3. Both

  4. None of them
Reveal answer Fill a bubble to check yourself
B Correct answer
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.