Question

two slits in Young's experiment produce intensities in the ratio 81:1 what is the ratio of amplitude of. light wave coming from them?​

Answer 1

Answer:

given = two slits intensities ratio  = 81:1

to find = ratio of amplitude =?

solution :-

let w₁ and w₂ be widths

and I₁ and I₂ be intensities.

∴  W₁ / W₂ = I₁ / I₂ =81 / 1

∴  a₁ / a₂ = $\sqrt{\frac{I1}{I2}$ = $\sqrt{ \frac{81}{1}$

∴  9 : 1

∴ 9 : 1 is a ratio of their amplitudes.