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Sail through JEE 2020: Waves

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Question 1

A car is moving along x-axis with a velocity v=20 m/s. it sounds a whistle of frequency 660 Hz. If the speed of sound is 340 m/s, the apparent frequency heard by the observer O (shown in the figure) is

Question 2

The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. the length of the string in metre when longitudinal tension is 9N, is

Question 3

A line is joining the observer and the vehicle a vehicle blows a horn of n frequency and is moving with a velocity of 20 m/s in direction perpendicular to that line. If the velocity of sound in air is 320 m/s and the observer heard sound of n +n1 frequency then

Question 4

What should be the speed of source, if speed of sound is 320 m/sec and the difference between apparent frequencies received by an observer during its approach and recession is 5 % of actual frequency of the source?

Question 5

A wire of length λ having tension T and radius r vibrates with natural frequency f. Another wire of same metal with length 2λ having tension 2T and radius 2r will vibrate with natural frequency

Question 6

In a resonance column experiment, the first resonance is obtained when the level of the water in tube is 20 cm from the open end. Resonance will also be obtained when the water level is at a distance of

Question 7

The tuning forks A & B produce notes of frequencies 256 Hz & 262 Hz respectively. An unknown note sounded at the same time as A produces beats. When the same note is sounded with B, beat frequency is twice as large. The unknown frequency could be

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Apr 28JEE & BITSAT