ok, so i have relooked over the question, done some calcualtions etc and still havent got that far. i personally dont think i have learnt enough of physics to understand some of it but could somebody please tell me what is the right answer and why it is. (i have tried to use the equations on the doppler effect etc and havent had much sucsess)
Merged post follows:
Consecutive posts mergedoh lol managed to answer is it
you can elimanate (sp?) A and B beacuse of the doppler shift effect and beacuse E=hf energy is proportional to frequency so it must be d.