MCQ
A vibrating body:
- AWill always produce sound
- BMay or may not produce sound if the amplitude of vibration is low
- CWill produce sound which depends upon frequency
- DNone of the above
Explanation:
A vibrating body vibrates the surrounding air, and when these vibrations reach our ears we hear sound. But, some vibrations cannot be perceived as sound to humans as human ears can only detect sound in the frequency range of 20Hz to 20,000Hz, so depending upon the vibration frequency, can only we define a vibration as sound.
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The slope of a speed-time graph gives:
Which of the following statement is correct regarding velocity and speed of a moving body?