Question

a laser emits light of wavelength 1.063 micrometer. The output power is 20 watt. what will be the energy emitted in 10 min.?​

Answer 1

Explanation:

Answer

The energy of a photon is E=

λ

hc

where h= Planck's constant, c= velocity of light.

So, E=

632.8×10

−9

(6.62×10

−34

)(3×10

8

)

=3.14×10

−19

J

Total power 1 mW means the energy per sec is given 1mJ=10

−3

J

Thus, number of photons emitted per sec =

3.14×10

−19

10

−3

=3.18×10

15

Answer 2

Answer:f

Explanation:f