Which of the following situations best demonstrates that a vibrating object is necessary for the production of sound?
Plucking a stretched guitar string and hearing a tone
Sound is produced when an object vibrates and sets the particles of the surrounding medium into to-and-fro motion, transmitting the disturbance as a sound wave.
A stationary metal rod and an undisturbed glass bottle do not vibrate, so they cannot produce any sound, and shining light involves no mechanical vibration either.
When a stretched guitar string is plucked, it vibrates rapidly and these vibrations create sound waves in the air that reach the listener as a musical tone.
Hence, the correct answer is Plucking a stretched guitar string and hearing a tone.
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Important Questions from Waves
- A high-pitch and a low-pitch sound have ________, respectively.
- The radar used by police to check over-speeding vehicles works on the principle of
- Which one of the following is NOT an electromagnetic wave?
- Wavelength and frequency of a radio wave are 12 m and 25 × 106 Hz respectively. Calculate its velocity.
Ultrasonic pulse echo technique, a non-destructive ultrasonic testing, is employed for any possible flaw detection in a metallic bar of thikness 30 cm. If the arrival times of the ultrasonic pulses are 45 μs and 90 μs respectively, the distance of the flaw from one end of the steel bar at which the ultrasonic pulse initially enters the steel bar, will be:
