Sound WavesMedium
Question
At a point, beat frequency of n Hz is observed. It means that :
Options
A.medium particles at that point are vibrating with a frequency of n Hz.
B.amplitude of vibrations changes simple harmonically with frequency n Hz at the point only
C.at that point, zero intensity is observed 2n times per second
D.amplitude of vibration changes simple harmonically with 
Hz at the point
Hz at the pointSolution
When two waves of different frequency superimposes beats is being formed.
Eq. of Two superimposed wave
Y = 2A cos(ω1 − ω2/2). Sin(ω1 + ω2/2)
2A cos(ω1 − ω2/2) is amplitude at that point. So frequency vibration is n/2
Eq. of Two superimposed wave
Y = 2A cos(ω1 − ω2/2). Sin(ω1 + ω2/2)
2A cos(ω1 − ω2/2) is amplitude at that point. So frequency vibration is n/2
Create a free account to view solution
View Solution FreeMore Sound Waves Questions
A locomotive engine is approaching a hill with speed of 30 m/s. It blows whistle of frequency 600 Hz the frequency of th...Waves from three soures of the same intensity and frequencies 2003, 2005 and 2013 Hz superimpose. The number beats per s...A train moving towards a hill at a speed of 72 km / hr sounds a whistle of frequency 500 Hz. A wind is blowing from the ...Two identical straight wire are stretched so as to produce 6 beats/s when vibrating simul-taneously. On changing the ten...A source when at rest in a medium produces waves with a velocity v and a wavelength of λ . If the source is set in motio...