Question

How many violet photons 7.5 X 10^14 Hz would are necessary to provide the energy of a single AA battery that contains 1300 J?

answer numerically using scientific notation with e and significant figures.

Answer 1

2.6 * 10^21 photons

Step-by-step explanation:

First we obtain the energy of one photon.

The energy of one photon = hf

h= Planks constant = 6.6 * 10^-34 Js

f = frequency of the radiation = 7.5 X 10^14 Hz

E = 6.6 * 10^-34 * 7.5 X 10^14

E= 49.5 * 10^-20 J

Number of photons = Total energy/ energy of one photon

Total energy = 1300 J

Number of photons = 1300/49.5 * 10^-20

Number of photons = 2.6 * 10^21 photons