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Class XI Physics Waves Quiz 7
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Question 1
The velocity of sound in air at20 °C and 1 atm pressure is 344.2 m/s. At 40 °C and 2 atm pressure, the velocity of sound in air is approximately
Question 2
A source and an observer are located at the same point. The source starts moving away from the observer at t = 0, with a constant acceleration a. If natural frequency of the source is n0 and speed of sound in air is v, then frequency received by the observer at time t will be –
Question 3
A whistle is rotated with 2 rotations/sec in a circle of radius 1 meter. A listener is sitting in the plane of circle outside the centre, then ratio of maximum and minimum frequencies heard by him will be
Question 4
The apparent frequency of sound heard by a listener is 10% more than the actual frequency of the note emitted by the source when the source moves towards the stationary listener with velocity v. When the source moves with a velocity 2v, the apparent frequency will be more than the actual frequency by–
Question 5
A jet fighter flies in a straight line over an airfield line over an airfield with a speed 264 m/s level with the ground, at a height of 600 m. If it emits a continuous note of frequency 1kHz, what is the change in apparent frequency as experienced by one of the ground crew over a 1.5 s interval as the jet flies overhead?
(Assume speed of sound is 340 ms-1)
(Assume speed of sound is 340 ms-1)
Question 6
A transverse wave described by y = (0.02m) sin [(1.0 m-1) x + (30s-1) t] propagates on a stretched string having a linear mass density of 1.2 × 10-4 kg/m. Find the tension in the string.
Question 7
The equation of a standing wave produced on a string fixed at both the ends is -
y = (0.4)sin [(0.314 cm-1)x] cos [(600 π s-1)t]
What would be the smallest length of the string?
y = (0.4)sin [(0.314 cm-1)x] cos [(600 π s-1)t]
What would be the smallest length of the string?
Question 8
The equation of a wave travelling in the (+) x-direction -
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Feb 15JEE & BITSAT