Question

Two sources of intensity 2I and 8I are used in an interference experiment. The intensity at a point where the waves from two sources superimpose with a phase difference of (a) zero (b)pi÷2and (c) pi​

Answer 1

Answer:

Intensity after interference is given by

a ) zero

I

f

=I

1

+I

2

+2

I

1

I

2

cosθ

=2I+8I+2×4I×cosθ

=18I

b) π/2

I

f

=I

1

+I

2

+2

I

1

I

2

cosθ

=2I+8I

=10I

c) π

I

f

=I

1

+I

2

+2

I

1

I

2

cosθ

=2I+8I−8I

=2I