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प्रश्न
What are ultrasonic? State and explain two applications of ultrasounds.
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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.
Name the sound of the frequency given below:
1000 Hz
What is ultrasound?
What do you understand by the term infrasonic vibrations?
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
What are ultrasonic?
What is echocardiography?
What are hearing aids?
State the properties of ultrasound that make it useful.
The range of audible frequency for the human ear is
