Question

200.0 J of light with wavelength 700 nm is shone onto a material. The number of photons in the light is-
7.14 X 10⁻²⁰
7.14 X 10⁻¹⁹
7.14 X 10²⁰
7.14 X 10¹⁹

Answer 1

Answer:

7.14×10^20

Explanation:

n=E×lambda/hc

substitute the value we get answer