Question

Define/Explain the following.
1. Vibration
2. Amplitude
3. Ultrasonic waves
4. Noise
5. Noise pollution

Answer 1

1. Vibration is a rapid back and forth movement of a body about a central position.
2. Amplitude of an oscillation is the maximum displacement of the bob from its mean position during oscillation.
3. Ultrasonic waves are sound frequencies above 20,000 Hz, which humans cannot hear these waves.
4. Noise is any unpleasant sound from any source that causes psychological or physiological discomfort.
5. Noise pollution is the sustained presence of unwanted, harmful and annoying noise in the environment.