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प्रश्न
Complete the following sentence:
Elephants produce ____________sound.
रिक्त स्थान भरें
उत्तर
Elephants produce infrasonic sound.
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संबंधित प्रश्न
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
Can you hear the sound produced due to vibrations of a seconds pendulum? Give reasons.
State the approximate speed of ultrasound in air.
State two applications of ultrasound.
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 does SONAR stand for? Where do we make use of SONAR?
1 hertz is equal to
