Our local public radio station (KJZZ) broadcasts at a frequency of 91.5 MHz.
A. What is the wavelength of the radio waves emitted by the KJZZ broadcast antenna? (m)
B. What is the wavelength of the radio waves emitted by the antenna of an AM station broadcasting at a frequency of 1545 kHz? (m)
2007-11-27 15:34:27 · 4 answers · asked by ariddlegirl 1 in Science & Mathematics ➔ Physics
A) 3.3m
B)194.17M
2007-11-27 16:47:14 · answer #1 · answered by Anonymous · 1⤊ 0⤋
A. 1 MHz =1 x 10^6 /seconds.
so.
3.00 x 10^8 m/s = (wavelength) (91.5 x 10^6)
then divide the first side by the second side to get wavelength.
Sorry, but I have to finish my own Chemistry homework now, so hope that helped for A. although B should be very similar, just figure out what kHz are.
2007-11-27 15:45:49 · answer #2 · answered by joseph d 2 · 0⤊ 0⤋
The wave equation is
f λ = v
f = frequency in 1/s (or Hertz)
λ = wavelength in m
v = velocity in m / s
In each problem, you know two of these parameters; calculate the third. Note that a kHz is 10^3 Hertz and a MHz is 10^6 Hertz.
2007-11-27 15:40:44 · answer #3 · answered by jgoulden 7 · 0⤊ 0⤋
lambda = 300000000ms^-1 / 91500000s^1
Do the same for (B)
wavelength = speed of light / frequency
or
l = c / f
2007-11-27 15:39:59 · answer #4 · answered by j_kkachi 2 · 0⤊ 0⤋