A bus is moving towards a huge wall with a velocity of 5 m s⁻¹. The driver sounds a horn of frequency 200 Hz. The frequency of the beats heard by a passenger of the bus will be..... Hz. (Speed of sound in air = 342 m s⁻¹)
Physics · Wave Motion
JEE Mains Practice

Question

A bus is moving towards a huge wall with a velocity of 5 m s⁻¹. The driver sounds a horn of frequency 200 Hz. The frequency of the beats heard by a passenger of the bus will be..... Hz. (Speed of sound in air = 342 m s⁻¹)

Physics · Wave Motion

G1 Physics · Accepted Answer

Step 1: Use v = √(B/ρ) in a fluid, v = √(Y/ρ) for longitudinal waves in a solid, or v = √(γRT/M) for an ideal gas. Step 2: Form any required ratio before substituting values. Step 3: Evaluate with the data given. Final: 6.