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Physics p1 questions! help

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hafza89:
guys please help me out
P1 physics november 2008 q 27, 32

q 27) a small microwave receiver is moved from T towards S. receives signals of alternate maxima and mininma intentsity. the distance between one maximum and the nest is 15 mm. what is the frequencey of the microwaves

A 1.0 x 10^7
B 2.0 x 10^7
C 1.0 x 10^10
D 2.o x 10^10

hafza89:


32 An electric power cable consists of six copper wires c surrounding a steel core s.

1.0 km of one of the copper wires has a resistance of 10 ? and 1.0 km of the steel core has a
resistance of 100 ?.
What is the approximate resistance of a 1.0 km length of the power cable?
A 0.61 ? B 1.6 ? C 160 ? D 610 ?

khuram234:
Nice questions

melodie_:
well i really don't think this question has anything to do with let's say diffraction, it's just about what the actual wavelength of a microwave is.. so, it's c :D

AbuxaR:
I think its either
A, B, c or D

!!!!! oh how genious i am !!!!! ;)

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