A carrier is phase modulated (PM) with frequency deviation of 10 KHz by a single tone frequency of 1 KHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is

a) 21 kHz

b) 22 kHz

c) 42kHz

d) 44kHz

Ans ; 44 khZ

 Initial B.W = 4 X10 = 40 khz

if deviation = d

del ( B.W ) = 2d

New B.W = 40 + 4 = 44 KHz