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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 10 - Wave Optics > A SONAR system fixed in a submarine operates at a frequency 40.0kHz. An enemy submarine moves towards the SONAR with a speed of 360 kmh^−1. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 ms^−1.

A SONAR system fixed in a submarine operates at a frequency 40.0kHz. An enemy submarine moves towards the SONAR with a speed of 360 kmh^−1. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 ms^−1.

A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string how long does he disturbance take to reach the other end ?