Two radio waves are used in the operation of a cellular telephone. To receive a

Question

Two radio waves are used in the operation of a cellular telephone. To receive a call, the phone detects the wave emitted at one frequency by the transmitting station or base unit. To send your message to the base unit, your phone emits its own wave at a different frequency. The difference between these two frequencies is fixed for all channels of cell phone operation. Suppose the wavelength of the wave emitted by the base unit is 0.34310 m and the wavelength of the wave emitted by the phone is 0.36114 m. Using a value of 2.9979 108 m/s for the speed of light, determine the difference between the two frequencies used in the operation of a cell phone. ______Hz

Explanation / Answer

c=fw
where c is the speed
f is the frequency
w is the wavelength


since its asking for frequencies we solve for the frequency in the equation.

f=c/w

the problem gives you two wavelengths :

w1=0.34310 and w2=0.36114

now you plug in the waveleght (w) for each individually:

f1=(2.9979x10^8)/(0.34310)
=873768580.589

f2=(2.9979x10^8)/(0.36427)
=822988442.6

To find the difference in frequencies:
f1-f2 or (873768580.589-822988442.6)

50780137

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