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ICSE Class 10 Physics 2017 Solved Paper

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Question : 50
Total: 65
A wire of length 80‌cm has a frequency of 256‌Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024‌Hz .
Solution:  
Given : l1=80‌cm,n1=256‌Hz,l2= ?, n2=1024‌Hz
We know, ‌‌n∝‌
1
l

(If tension ' T ' is constant)
‌∴‌‌n1l1=n2l2
or ‌l2=‌
n1l1
n2
=‌
256×80
1024

‌=20‌cm‌. ‌
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