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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 10 - Wave Optics > A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7 km/s ? The operating frequency of the scanner is 4.2 MHz.

A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7 km/s ? The operating frequency of the scanner is 4.2 MHz.

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 ?