Question

A wavelength of frequency 250 Hz travels with a speed of 4800 m/s in iron . (i) What will be it's wavelength in iron ? (ii) What will be it's wavelength in air if it's speed in air is 332 m/s? ​

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=100metres

Answer 2

Answer:

In iron the wavelength is 19.2m

In air the wavelength is 1.328m

Explanation:

We know that

velocity = wavelength × frequency

then by this formula we can find the answer

you can see the solution in the image.

Hope this is helpful.