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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 -
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 24JEE & BITSAT