(a) The ultra high frequency em radiations, continuously emitted by a mobile phone, may harm the system of the human body.
(b) Sister Anita is shown
(i) Concern about her brother
(ii) Awareness about the likely effects of em radiations on human body
(iii) Sense side of responsibility
(c) The side bands are (vc + vm) and (vc - vm)
or (1000 + 10)kHz and (1000 - 10)kHz
1010 kHz and 990 kHz