Question

The path difference between two interfering waves at a point on screen is 70.5 times the wave length. The point is colour​

Answer 1

Answer:

$\huge\bold\star\pink{Miss phenomenal}\star$

This is known as constructive interference, inwhich two waves (of the same wavelength) interact in such a way that they are aligned, leading to a new wave that is bigger than the original wave.

Answer 2

The path difference between two interfering waves at a point on screen is 70.5 times the wave length.The point is Dark

Explanation:

Given

The path difference is 70.5 times wave length

If wave length is $\lambda$

Then, path difference

$\Delta x=70.5\lambda$

$\implies \Delta x=\frac{141}{2}\lambda$

$\implies \Delta x=141\frac{\lambda}{2}$

We know that

If the path difference is $2n\frac{\lambda}{2}$ i.e. even multiple of half of wavelength then it will be bright band

If the path difference is $(2n-1)\frac{\lambda}{2}$ i.e. odd multiple of half of wavelength then it will be dark band

Here, the path difference is odd multiple of half of wavelength

Therefore, the point will be Dark.

Hope this answer is helpful.

Know More:

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