Posted by **mm.** on Monday, March 15, 2010 at 12:34pm.

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

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