Question

The amplitudes of two interfering waves are $4cm$ and $3cm$ respectively. If the resultant amplitude is $1cm$ then the interference becomes

• A. constructive
• B. Destructive
• C. Both constructive and destructive
• D. given data is insufficient

Answer 1

The correct option is B Destructive

When the super position of the two waves takes place the resultant wave is a
sum of the two waves. As the resultant amplitude is $1cm$ which is the difference between $4cm$ and $3cm$ the two waves superposition took place when they are out of phase. Hence the answer is destructive interference.