11th Physics Chapter 8 Waves Short Question Answers
11th Physics Chapter 8 Waves Short Question Answers Below
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Y= y1, y2,y3,………………………………………….. yn be the displacement due to individual waves, then the resultant ‘y’ is given by
Y = y1+y2+y3+………………………………………. yn
Vt =(V0+ o.61t)
Or Vo = vt – 0.61t
This relation shows that one degree Celsius rise in temperature produces approximately 0.61 ms -1 increase in the speed of sound.
Frequency =f= 1kHz= 1000Hz
Or λ= v/f
putting the values, we get
λ= 200/1000= 0.2 m Ans
When both ends of an organ pipe are open , it is called an open pipe.
In the case of open pipe, the frequency of any harmonic is given by
fn= nv/2/= nf1…………………. (1)
where n = 1,2,3,4,……………..
v = speed of sound in air and ‘/’ is the length of pipe.
f1 = Fundamental frequency.
The above equation (1) shows that all harmonic in an open pipe are of frequencies f1,2f1, 3f3,4f1 and so on. It means all harmonic are present in an open pipe.
In a closed pipe, only odd harmonics are produced by using the equation
fn = n v/4l = nfl……………………….. (2)
where n= 1,3,5, ………………………………….
The above equation (2) shows that only first, third, fifth harmonics and so on are present in an closed pipe.
Comparing both the case (1) and (2) we see that the pipe which is open at both ends is richer in harmonic (or overtones).
Which is called harmonic series. The lowest of these (i.e.f1) is called fundamental frequency and the others which are integral multiples of the fundamental are called harmonic or overtones.
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