## 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…

## A stone dropped from the top of a tower of height 300 m high splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m s–1? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.2:- A stone dropped from the top of a tower of height 300 m high splashes into the water of a pond near the base of the tower. When is the…

## 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 the disturbance take to reach the other end? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-15 Waves

Q.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…

## A mass attached to a spring is free to oscillate, with angular velocity ω, in a horizontal plane without friction or damping. It is pulled to a distance x0 and pushed towards the centre with a velocity v0 at time t = 0. Determine the amplitude of the resulting oscillations in terms of the parameters ω, x0 and v0. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-14 Oscillations

Q.25:- A mass attached to a spring is free to oscillate, with angular velocity ω, in a horizontal plane without friction or damping. It is pulled to a distance x0 and…