Question

Two slits in young’s double slit experiment have widths in the ratio 81: 1. The ratio of the amplitudes of light waves is :

• A. 3:1
• B. 3:2
• C. 9:1
• D. 6:1

Answer 1

Answer: (C)

9:1

Answer 2

: Width ratio, $\frac{\beta_{1}}{\beta_{2}} = \frac{I_{1}}{I_{2}} = \frac{81}{1}$

$\therefore$Amplitude ratio,

$\frac{A_{1}}{A_{2}} = \sqrt{\frac{I_{1}}{I_{2}}} = \sqrt{\frac{81}{1}} = 9:1$