Q.

A copper wire is held at the two ends by rigid supports. At 300C , the wire just taut, with negligible tension. Find the speed of transverse waves in this wire at  100C (Young modulus of copper  =1.3×1011N/m2 )Co-efficient of linear expansion of copper  =1.7×10−5/0cDensity of copper  =9×103 kg/m3

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

a

70 m/sec

b

60 m/sec

c

40 m/sec

d

100 m/sec

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Y=stressstrain ⇒Y=F/AΔl/l ⇒Y=FlAΔl ⇒F=YAΔll Also, change in length due to temperature = Δl=αl∆θ F=YAα∆θ Speed of wave on string : V=Fμ where μ=ml=Aρ ∴V=Yα∆θρ  = 1.3×1011×1.7×10−5×209×103 V=70 m/sec.
Watch 3-min video & get full concept clarity
Related Blogs
Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
Result Producing online coaching for JEE/NEET of south India
Largest All India Test Series for JEE/NEET
Best Books for IIT JEE
Best Books for NEET
How to Join IIT after 10th
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

Related Blogs
Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
Result Producing online coaching for JEE/NEET of south India
Largest All India Test Series for JEE/NEET
Best Books for IIT JEE
Best Books for NEET
How to Join IIT after 10th
whats app icon