An open organ pipe of length is in unison with an identical pipe at

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

An open organ pipe of length

0.85\,\text{m}

is in unison with an identical pipe at

20^{\circ}\text{C}

. The speed of sound in air varies with temperature according to

v = 332 + 0.6T

(in m/s,

T

^{\circ}\text{C}

). If the temperature of one pipe is raised to

30^{\circ}\text{C}

while the other remains at

20^{\circ}\text{C}

, calculate the time interval between successive amplitude maxima of the beats produced when both pipes sound their fundamental notes. (a)

0.14\,\text{s}

(b)

0.28\,\text{s}

(c)

0.57\,\text{s}

(d)

0.20\,\text{s}