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## Homework Statement

GSM networks use microwaves of 20 cm in wavelength.

The energy carried by one trillion (10^12) photons of this wavelength is closest to ...

Question 1 answers

A)10-16 Joules

b)10-15 Joules

c)10-14 Joules

d)10-13 Joules

e)10-12 Joules

## Homework Equations

Instructions: The speed of light is c = 3 x 108 m/s

Plank's constant is h = 6.63 x 10-34 J s

## The Attempt at a Solution

E = hf

c = wavelength x f

f = (3.00 x 10^8) / (0.2) = 1.5E9

E = 6.63 x 10-34 J s x 1.5E9

E = 9.945E-25

Do I Multiply by 10^12 to account for the energy carried by one trillion (10^12) photons making the answer 9.945E-13 of d from above