Two sources emit beams of light of wavelength 550 nm. The light from source A ha

Question

Two sources emit beams of light of wavelength 550 nm. The light from source A has an intensity of 10 µW/m2, and the light from source B has an intensity of 20 µW/m2. This is all we know about the two beams. Which of the following statements about these beams are correct? (There could be more than one correct choice.)

1) Beam B carries twice as many photons per second as beam A.

2) The frequency of the light in beam B is twice as great as the frequency of the light in beam A.

3) A photon in beam B has twice the energy of a photon in beam A.

4) A photon in beam B has the same energy as a photon in beam A.

5) None of the above statements are true.

Explanation / Answer

Here wavelength of light beams are same so energy of each photon and beams will be same

Intensities are different it means number of photon per unit area are different

As intensity of beam B is twice as beam A

so option 1 is correct

and option 4 is correct

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