In: Physics
Voyager 1 space probe transmits to Earth at a frequency of 6.2 GHz. At some point the intensity of the wave was I = 2.95e-25 W / m2. a) What will be the intensity of the wave at half the distance from the space probe?
b) What is the wavelength of the transmitted signal?
If the power of the sun is 3.87e + 26 W.
c) At what distance from the sun, the radiation intensity will be 0.393 W / m2?
e) If we consider the previous distance as the Voyager 1 distance to the earth. And that the power of the antenna is 18 W. What will be the intensity of the wave transmitted by Voyager 1 that reaches the earth?
f) How many times farther is the Voyager 1 probe from the beginning of the problem?
Need a,b,c,d,e and f. Thanks!
Is this complete question ????
Intensity at what point is 2.95e-25 ??
anyway. intensity varies as
I = 1/r2
______________________________________________
What is the wavelength of the transmitted signal?
wavelength = speed of light / frequency
wavelength = 3e8 / 6.2e9
wavelength = 0.04838 m
__________________________________
At what distance from the sun, the radiation intensity will be 0.393 W / m2
assuming the sun is an isotropic source ( which it is )
I = power / area
area = power / intensity
4r2 = power / intensity
4r2 = 3.87e26 / 0.393
solve for r, we get
r = 8.852e12 meters ( mind the units , please !!!)
______________________________________________
If we consider the previous distance as the Voyager 1 distance to the earth. And that the power of the antenna is 18 W. What will be the intensity of the wave transmitted by Voyager 1 that reaches the earth
Here antenna is not treated as isotropic source because I think it is always pointed towards earth
Intensity = 18 / pi * 8.852e122
Intensity = 7.312e-26 W/m2
__________________________________________