- #1
thenewbosco
- 185
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There are two parts to this but i solved the first part:
in part a) i was to show, for an electomagnetic wave reflected back to its source from a mirror approaching at speed v, that the reflected wave had frequency f=f_{source}\frac{c+v}{c-v} where fsource is the source frequency and c is the speed of light.
now i am asked: when v is much less than c, the beat frequency is much smaller than the transmitted frequency. In this case use the approximation f + f_{source}\approx 2f_{source} and show that the beat frequency can be written:
f_{beat}=\frac{2v}{\lambda}
i don't know how to go about this. I was thinking to solve for fsource and put it into the equation from part a. but this doesn't work...any help
in part a) i was to show, for an electomagnetic wave reflected back to its source from a mirror approaching at speed v, that the reflected wave had frequency f=f_{source}\frac{c+v}{c-v} where fsource is the source frequency and c is the speed of light.
now i am asked: when v is much less than c, the beat frequency is much smaller than the transmitted frequency. In this case use the approximation f + f_{source}\approx 2f_{source} and show that the beat frequency can be written:
f_{beat}=\frac{2v}{\lambda}
i don't know how to go about this. I was thinking to solve for fsource and put it into the equation from part a. but this doesn't work...any help
