Waves Test - 29...

An ultrasonic scanner is used in a hospital to detect tumours in tissue. The working frequency of the scanner is 4.2 mega Hz. The velocity of sound in the tissue is $$1.7 kms^{-1}$$. The wavelength of sound in the tissue is nearest to 

In a Kundt's tube experiment, the heaps of lycopodium powder are collected at $$20\ cm$$ separations. The frequency of tuning fork used is

Two wires with different densities are joined at $$x = 0$$. An incident wave $$Y_i = A_i\sin(\omega t -k_1x)$$ travelling from left to right is partially reflected and partially transmitted $$(Y_t = A_t\sin(\omega t -k_2x))$$ at $$x = 0$$. If the amplitude of transmitted wave is $$A_t$$ then $$^{\Large A_t}/_{\Large A_i}$$ is

The displacement $$y$$ in centimeters is given in terms of time $$t$$ in second by the equation: $$y=3\sin 3.14t+4\cos 3.14 t$$, then the amplitude of SHM is

The equation of displacement of a harmonic oscillator is $$x=3\sin{\omega t}+4\cos{\omega t}$$. The amplitude of the particles will be

The wavelength of a sound wave is reduced by 50%. Then the percentage change in its frequency will be

If the frequency of a sound wave is increased by 25%, then the change in its wavelength will be

A sound wave of frequency $$500\ \text{Hz}$$ covers a distance of  $$1000\ \text{m}$$ in $$5\ \text{s}$$ between points $$\displaystyle x$$ and $$\displaystyle y$$. Then the number of waves between $$\displaystyle x$$ and $$\displaystyle y$$ are

A sonometer wire, $$100\ \text{cm}$$ in length has a fundamental frequency of $$330\ \text{Hz}$$. The velocity of propagation of transverse waves along this wire is :

Interference event is observed