## 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–1? The operating frequency of the scanner is 4.2 MHz. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.7:- 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…

## A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m s–1 and in water 1486 m s–1. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.6:- A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted…

## You have learnt that a travelling wave in one dimension is represented by a function y = f (x, t)where x and t must appear in the combination x – v t or x + v t, i.e. y = f (x ± v t). Is the converse true? Examine if the following functions for y can possibly represent a travelling wave: (a) (x – vt)2 (b) log [(x + vt) / x0] (c) 1 / (x + vt) | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.5:- You have learnt that a travelling wave in one dimension is represented by a function y = f (x, t)where x and t must appear in the combination x –…

## Use the formula v = √γP/ρ to explain why the speed of sound in air (a) is independent of pressure, (b) increases with temperature, (c) increases with humidity. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.4:- Use the formula v = √γP/ρ to explain why the speed of sound in air (a) is independent of pressure, (b) increases with temperature, (c) increases with humidity.     Answer:-…

## A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20 °C = 343 m s–1. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.3:- A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave…