The oscillation of a body on a smooth horizontal surface is represented by the equation,
X = A cos ( t)
where, X = displacement at time t
= frequency of oscillation
Which one of the following graphs shows correctly the variation of 'a' with 't'?
The number of possible natural oscillation of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are:
( velocity of sound = 340 ms-1)
A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving a head of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be: