I am studying for my exams and this is a homework problem in the book. My instuctor gave us the numerical answers for it, but I am not sure how to get them.
A radar transmitter used to measure the speed of pictched baseballs emits pulses of .02 m wavelength that are 2.5 x 10^-7 seconds in duration.
What is the length of the wave packet produced?
[answer 74.6 m]
To what frequency should the receiver be tuned?
[answer 1.5 x 10^10 Hz]
Thanks.
2006-12-05 02:30:42 · 2 answers · asked by saywhat198 1 in Science & Mathematics ➔ Physics
Since the speed of electromagnetic waves is about 3*10^8 m/s, the frequency of the radar is 3*10^8/.02 or about 1.5*10^10 Hz. That is the frequency to which the receiver should be tuned.
Traveling at 3*10^8 m/s, the wave packet created in 2.5*10^-7 seconds is simply (3*10^8)*(2.5*10^-7) or about 75 m.
Doug
2006-12-05 02:39:45 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
Commercial RADAR units operate in the 8.5GHz to 10.5GHz range.
Any RF can be used as RADAR, so long as you have the equipment for it.
You can find the freq of your particular problem by
f=3^8/wavelength
2006-12-05 10:36:18 · answer #2 · answered by credo quia est absurdum 7 · 0⤊ 0⤋