EASY
NDA & NA EE
IMPORTANT
Earn 100

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

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Important Questions on Oscillations and Waves

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]
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 22
The ratio of the frequencies of the fundamental notes between one organ pipe open at both ends and another organ pipe of same length closed at one end 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 23
A given tube is open at both the ends. The shortest length of a column of air that would vibrate at 331 Hz in such a tube is (the velocity of sound is 331 m s-1)
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 25
If the length of second's pendulum is increased by 2 %, how many seconds will it lose per day?
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 26
Two sound waves passing through air have their wavelengths in the ratio 4: 5. Their frequencies are in the ratio,