COMEDK 2022

Choose the incorrect statements.

A particle is performing simple harmonic motion. Equation of its motion is \(x = 5\sin \left( {4t - {\pi \over 6}} \right),x\) being the displacement from mean position. Velocity (in ms\(^{-1}\)) of the particle at the instant when its dis...

The resultant of two forces acting at an angle of 120\(^\circ\) is 10 kg-W and is perpendicular to one of the forces. That force is

In Young's double slit experiment, the two slits are separated by 0.2 mm and they are 1 m from the screen. The wavelength of the light used is 500 nm. The distance between 6th maxima and 10th minima on the screen is closest to

In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in a liquid of refractive index \(\frac{4}{3}\) without changing geometrical arrangement, the new fringe width will be

A bat emitting an ultrasonic wave of frequency 4.5 \(\times\) 104 Hz at speed of 6 m/s between two parallel walls. The two frequencies heard by the bat will be

A source of sound emits sound waves at frequency \(f_0\). It is moving towards an observer with fixed speed \({v_s}\) (\({v_s},v\), where \(v\) is the speed of sound in air.) If the observers were to move towards the source with speed $$v_0...

The string of length 2 m is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of 500 Hz, then the waves would travel on it with a velocity of

If kinetic energy of a body is increased by 300%, then percentage change in momentum will be

A particle of mass \(m\) is moving in a horizontal circle of radius \(r\) under a centripetal force given by \(\left(\frac{-K}{r^2}\right)\), where \(K\) is a constant. Then