Wave Motion 2 Question 17

17. An open pipe is in resonance in 2 nd harmonic with frequency f1. Now one end of the tube is closed and frequency is increased to f2 such that the resonance again occurs in nth harmonic. Choose the correct option.

(2005, 2M)

(a) n=3,f2=(3/4)f1

(b) n=3,f2=(5/4)f1

(c) n=5,f2=54f1

(d) n=5,f2=34f1

Show Answer

Answer:

Correct Answer: 17. (c)

Solution:

f1=vl(2 nd harmonic of open pipe )f2=n(v4l)(nth harmonic of closed pipe )

Here, n is odd and f2>f1. It is possible when n=5 because with n=5

f2=54(vl)=54f1



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक