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प्रश्न
Complete the following sentence:
Ultrasound is of frequency ___________.
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उत्तर
Ultrasound is of frequency above 20 kHz.
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संबंधित प्रश्न
Complete the following sentence:
Bats can produce and hear ___________ sound.
Name the sound of the frequency given below:
10 Hz
Can you hear the sound produced due to vibrations of a seconds pendulum? Give reasons.
Sonar makes use of :
How do bats locate their prey during a flight?
State four practical uses of ultrasonic vibrations.
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
Does SONAR make use of infrasonic sound?
Is the energy carried by the ultrasound very high or very low?
