A. 7.9 cm
B. 15.8 cm
C. 3.9 cm
D. 18.1 cm
2007-03-29 21:22:58 · 4 answers · asked by Unexpected 1 in Science & Mathematics ➔ Physics
A. 7.9 cm ( actually i calculate 7.5 cm, actual antennas are a little less than 1/2 wave length dimensionally)
2007-03-30 00:12:30 · answer #1 · answered by delujuis 5 · 0⤊ 0⤋
The total length of the antenna is equal to a half-wavelength.
So you need to work out the wavelength of the waves in question.
c = f*lambda
lamdba = c/f = 3x10^8/1.9x10^9 = 0.158 m = 15.8 cm
2007-03-30 04:29:09 · answer #2 · answered by dudara 4 · 0⤊ 0⤋
wavelength = c/frequency
c= 310^8m/s frequency = 1.9 10^9
wavelength = 310^8/1.9 10^9=0.158m
and half wavelength =0.158/2 = 0.079m= 7.9 cm
Answer A
2007-03-30 05:49:49 · answer #3 · answered by maussy 7 · 0⤊ 0⤋
Dudara forgot that it's 1/2 wavelength,, so 7.9cm.
2007-03-30 05:00:59 · answer #4 · answered by 1000 Man Embassy 5 · 0⤊ 0⤋