Question

A beam of red light has an amplitude 2.5 times amplitude of second beam of the same colour . calculate the ratio of the intensities of the two waves.

Answer 1

The ratio of the intensities of the two waves is 25:4

It is given that the beam of red light has an amplitude = 2.5 times that of the amplitude of second beam of the same colour.

We know that, Intensity of any colour (I) is proportional to the square of the amplitude (A)

Let for the first beam, its intensity be I and for the second beam let it be I'.

So, A = 5A'/2

If amplitude of the first wave is A, and the second one has A', then

I/I' = A²/A²'

I/I' = 25A'²/4A'²

So, I/I' = 25/4

Answer 2

Answer:

a beam of a red light has an amplitude 2.5 times amplitude of a second beam of the same colour calculate the ratio of the in insecticides of the two waves.

Explanation: