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प्रश्न
What is ultrasound?
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उत्तर
Sounds of frequency above 20 kHz are called ultrasound.
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संबंधित प्रश्न
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Name the sound of the frequency given below:
40 kHz
State two applications of ultrasound.
State four practical uses of ultrasonic vibrations.
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?
What is echocardiography?
Describe a simple method to find the depth of a submerged ship.
Ultrasound has frequency of vibration
