Farmer brown claims that a very powerful radio transmission antenna next to his land has caused sparks to jump along the wire in a fence gate, and from there onto one of his sheep.
The inspection of the site indicates that the gate is made of three strands of barb wire that are each 3.00m long. An inspection of the antenna shows that it is oriented vertically and is transmitting a signal of 6.67* 10 to the power of 5 Hz . You decide that this is highly unlikely . Describe at least 2 reasons why the evidence makes Farmer Brown's case suspicious . Show any supporting calculations.
PLS HELP ME !!!!!!
2007-05-13 06:11:06 · 3 answers · asked by K_K 1 in Science & Mathematics ➔ Physics
The output from the antenna will be vertically polarized and therefore not likely to induce a strong signal in horizontal wires in the gate.
Using wavelength * frequency = velocity we can calculate the wavelength of the signal (lambda) as
lambda = 3 * 10^8 / 6.67 * 10^5 = 450m (approximately)
The 3m lengths of gate wire are therefore far too short to be displaying any sort of resonance effect which would give rise to high voltages appearing at the ends.
2007-05-13 06:50:57 · answer #1 · answered by lunchtime_browser 7 · 3⤊ 0⤋
You're missing some units to complete the problem. However, I'd bet that since you're given the size and orientation of the wire in the gate that the source (radio transmission antenna) won't couple effectively to the load (gate antenna) at that frequency.
You're missing the frequency since 5 is the exponent, i.e. 6.67 x 10^5
2007-05-13 06:41:04 · answer #2 · answered by the_meadowlander 4 · 0⤊ 0⤋
It won't work... there is no such THING as 6.67* 10 to the power of 5 Hertz... because Hertz is a measurement of FREQUENCY and not a unit of POWER.
In addition.. do you have ANY idea how much POWER it takes to produce an RF Field at 5 Hertz?... That would be nearly impossible to achieve unless you had Hoover Dam next door to tap for the AC
2007-05-13 06:21:07 · answer #3 · answered by Anonymous · 0⤊ 0⤋