Now,
Calculate the Intensity of Your

Radio Source in Janskys

Radio Source in Janskys

Use the
equation: S = 2kt/Ae where S is the radio intensity, k is Boltzmans constant (1.38 x
10-23 J/K), t is the temperature in Kelvins, and Ae is the effective area of the telescope dish.

Since the
telescope is only 30% efficient the Ae =
.30 (117 m2) = 35.1 m2.

So, from the above equation we have:

2 (1.38 x 10-23 J/K)
(4.25 K)/35.1 m2 =

3.34 x 10-24 J/m2

Remember 1 Janksy = 1 x 10-26 Watts/m2/Hz

So 3.34 x 10-24 J/m2/1 x 10-26 Watts/m2/Hz =

334 Janskys