63 questions asked across 15 exam years, newest first
The frequency of a car horn encountered a change from 400 Hz to 500 Hz, when the car approaches a vertical wall. If the speed of sound is 330 m/s. Then the speed of car is ___________ km/h.
Answer: 132
The mass per unit length of a uniform wire is 0.135 g/cm. A transverse wave of the form is produced in it, where x is in meter and t is in second. Then, the expected value of tension in the wire is . Value of x is _________. (Round off to the nearest integer)
Answer: 1215
A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?
Answer: A
