Question

Ratio of intensities of two waves is $9:1$. If these two are superimposed, what is the ratio of maximum and minimum intensities?

• A. 9 : 1
• B. 3 : 1
• C. 4 : 1
• D. 5 : 3

Answer 1

Answer: (C)

Ratio of the intensities $=9:1$
$\therefore$ Ratio of the amplitudes $=3:1$
On superposition,
$\frac{\text{ Maximum Intensity }}{\text{ Minimum Intensity }}=\frac{(3+1{)}^2}{(3-1{)}^2}=4:1$.