Question

A wave of frequency 250 Hz is produced in
an iron rod in which its velocity is 4800 m/s.
Now, it passes into air in which velocity is
332 m/s. Its wavelength in iron will be
(1) 4800 (332/250) m.
(2) (4800/250) m.
(3) (332/250) m.
(4) 4800 / (332x250) m.​

Answer 1

Answer:

As per the given data, we have

λ=100cm=1metre

n=250Hz

Number of waves produced=N=100

Distance travelled=s=?

We know that s=speed×time=v×t and v=λ×n

The time taken to produce one wave is known as Time Period T

It is given by T=

n

1

t=T×N

s=v×t=λ×n×t=λ×n×T×N

=λ×n×

n

1

×N=λ×N

=1×100=100metres

Answer 2

Answer:

4)4800/(332×250)m .........