A 1 KW signal is transmitted using a communication

Question:
A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in dB = 10 log P0/P1]

(a) 900 W

(b) 100 W

(c) 990 W

(d) 1010 W

Solution:

(b) 100 W