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Class XI Physics Waves 2

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Question 1

A wire under tension vibrates with a fundamental frequency of 600 Hz. If the length of the wire is doubled, the radius is halved and the wire is made to vibrate under one-ninth the tension. Then the fundamental frequency will become

Question 2

Two waves are represented by
y₁ = a₁ cos (ωt – kx) and
y₂ = a₂ sin(ωt – kx + π/3)
Then the phase difference between them is -

Question 3

The frequency of the first overtone of a closed pipe of length L₁ is equal to that of the first overtone of an open pipe of length L₂. The ratio of their lengths (L₁ : L₂) is

Question 4

Two sound waves, originating from the same sound source travel along different paths in air and then meet at a point. The speed of the sound is 330 m/s. If the source vibrates at a frequency of 500 Hz and one path is 33 cm longer than the other, then the nature of interference is -

Question 5

The frequencies of sources A and B as shown in figure are same. The nature of interference at points P, Q and R will be if AB =

and the two sources are in same phase –

Question 6

Light from source consists of two wavelength

. If D = 2m and d = 6.5 mm. The minimum value of y where the minima of both the wave lengths coincide.

Question 7

The velocity of sound in an ideal gas at temperature T₁ and T₂ K are v₁ and v₂ respectively. If the root mean square velocity of the same gas at same temperature are c₁ and c₂ then–

Question 8

The fundamental frequency of a sonometer wire increases by 6 Hz if its tension is increased by 44% keeping the length constant. Find the change in fundamental frequency of the sonometer wire, if the length of the wire is increased by 20% keeping original tension in the wire?

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Aug 24NEET & AIIMS