# physics

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GSM networks use microwaves of 20 cm in wavelength.

The energy carried by one trillion (1012) photons of this wavelength is closest to ...

a. 10^-16 Joules
b. 10^-15 Joules
c. 10^-14 Joules
d. 10^-13 Joules
e. 10^-12 Joules

• physics -

E (per photon) = h c/(wavelength)

I assume you know what h anc d are.

Do the numbers and multipy by a trillion.

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