Two identical flutes produce fundamental notes of frequency `300Hz` at `27^@C`. If the temperature of air in one flute is increased to `31^@C`, the number of the beats heard per second will be

Two identical wires have a fundamental frequency of 100Hz, when kept under the same tension . If the tension of one of the wires is increased by 21% , the number of beats produced is

A stretched string is in unison with a tuning fork of frequency 392Hz. If the length of the string is decreased by 2% , then the number of beats heard per second will be

Two identical wires have the same fundamental frequency of 400 Hz . when kept under the same tension. If the tension in one wire is increased by 2% the number of beats produced will be

Two identical wires are stretched by the same tension of 101 N and each emits a note of frequency 202 Hz . If the tension in one wire is increased by 1N , then the beat frequency is

Two identical stringed instruments have frequency 100 Hz . If tension in one of them is increased by 4% and they are sounded together then the number of beats in one second is

Two air columns producing their fundamental notes , give rise to 3 beat/s . If the air column vibrates in third harmonics , then the number of beat/s will be

A sonometer wire is in unison with a tuning fork of frequency 150 Hz. If the tension in the wire is increased by 1%, how many beats per second will be heard ?

A car is moving with a velocity of 5 m//s towards huge wall. The driver sounds a horn of frequency 165 Hz . If the speed of sound in air is 335 m//s , the number of beats heard per second by the driver is

The fundamental frequency of an open end pipe is 300 Hz, when air is at a temperature of 27^@C . If the temperature increases to 29^@C , then the frequency becomes