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According to their frequencies, waves are separated into three categories:
(1) Audible or sound waves : Range 20 Hz to 20 KHz. These are formed by vibrating bodies like as vocal cords, membrane or stretched strings.
(2) Infrasonic waves : Frequency lie below 20 Hz.
Example : waves formed during earth quake, ocean waves etc.
(3) Ultrasonic waves : Frequency greater than 20 KHz. Human ear cannot listen these rays, certain creatures such as dog, bat and mosquito show result to these.
what is conversion of momentum?
The discharge over a triangular notch can be written as Q = (8/15) Cd (2g)0.5 tan(θ/2) H5/2 If an error of 1% in measuring H is introduced determine the corresponding error
Ask question #Minimum 100 words how is temperature coefficient of resistance helpful to mankind?accepted#
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sensitivity of moving coil galvanometer can be increased by decreasing?
why does rain water boils faster than fresh water
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