Three different vibrating objects produce three types of sounds X, Y and Z. Sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in hospitals to break kidney stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated.

(a) What type of sounds are (i) X (ii) Y, are (iii) Z ?

(b) Name one device which can produce sound like X.

(c) Name one device in a science laboratory which can produce sound like Y.

(d) Name one device in our homes which can produce sound like Z.

(e) What is the frequency range of sounds like Z ?

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Solution

(a) (i) Ultrasound
(ii) Infra sound
(iii) Audible sound

(b) SONAR

(c) Simple pendulum.

(d) Doorbell.

(e) 20 - 20,000 Hz

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(a) (i) Ultrasound (ii) Infra sound (iii) Audible sound (b) SONAR (c) Simple pendulum. (d) Doorbell. (e) 20 - 20,000 Hz

(a) (i) Ultrasound
(ii) Infra sound
(iii) Audible sound

(b) SONAR

(c) Simple pendulum.

(d) Doorbell.

(e) 20 - 20,000 Hz