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प्रश्न
Complete the following sentence:
Bats can produce and hear ___________ sound.
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उत्तर
Bats can produce and hear ultrasonic sound.
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संबंधित प्रश्न
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Complete the following sentence:
Infrasonic sound is of frequency ______________.
State the approximate speed of ultrasound in air.
The properties of ultrasound that make it useful are
Sonar makes use of :
What is Galton’s whistle? To what use is it put?
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.
What are ultrasonic? State and explain two applications of ultrasounds.
What does SONAR stand for? Where do we make use of SONAR?
