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NDA & NA EE
IMPORTANT
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For a particle executing SHM, the equilibrium position is at x=0 and the amplitude at x=0 and amplitude at x=A, the K.E. of the particle will be equal to the potential energy

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Important Questions on Oscillations and Waves

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 13
Two simple pendulums have the same period of oscillation. The necessary condition for this is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 14
An elastic spring has a force constant k. It is cut into three equal parts. The force constant of each part is
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 16
There are two strings of equal length and diameter but the densities are in the ratio 1: 2, they are stretched by a tension T. The ratio of frequencies will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 17
Consider the following statements. In a stationary wave,
I. All the particles perform the simple harmonic motion,
II. Particles on the opposite sides of a node vibrate with a phase difference of π,
III. The amplitude of vibration of a particle at an antinode is equal to that of either component wave,
IV. All the particles between two adjacent nodes vibrate in phase,
Of these statements
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 18
The apparent frequency noted by a moving listener away from the stationary source is 10 % less than the real frequency. If the velocity of sound is 330 m s-1, then the velocity of the listener is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 19
The wavelength of light received from a galaxy is 4 % greater than that received from an identical source on the earth. The velocity of the galaxy relative to the earth is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 20
The earth is moving towards a stationary star with a velocity of 100 km s-1. If the wavelength of the light emitted by the star is 5000 Å, then the change in wavelength apparent to an observer will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 9 - Oscillations and Waves>Practice Exercise>Q 21
If the frequency of a note emitted by a source changes by 20% as it approaches an observer and then recedes away from him, the speed of the source is nearly [given speed of sound =330 m s-1]