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प्रश्न
What are ultrasonic? State and explain two applications of ultrasounds.
उत्तर
Ultrasonic sound is the sound having frequency more than 20KHz. The application of ultrasonic sound is as follows:
(i) It is used to detect the flaws in metal casting of automobile tyres.
(ii) Used in hospitals to detect defects in certain parts of the body.
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संबंधित प्रश्न
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
 |
 |
| I | II |
 |
 |
| III | IV |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
Complete the following sentence:
Infrasonic sound is of frequency ______________.
Name the sound of the frequency given below:
1000 Hz
Name the sound of the frequency given below:
40 kHz
State two applications of ultrasound.
Sonar makes use of :
State four practical uses of ultrasonic vibrations.
What is echocardiography?
State the main components of a hearing aid.
State the properties of ultrasound that make it useful.
