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Help! Quick physics question

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MaNi_DaDuDe:
http://www.srepapmaxeeeerf.org/A%20Level/Physics/CIE/2006%20Nov/9702_w06_qp_6.pdf

Q15b? Why is it 9kHz?

Also, Q15c?

falafail:

--- Quote from: MaNi_DaDuDe on April 22, 2010, 01:25:41 pm ---http://www.srepapmaxeeeerf.org/A%20Level/Physics/CIE/2006%20Nov/9702_w06_qp_6.pdf

--- End quote ---

WTF IS THAT?!?!?!!  :o

waitt... paper 6? why are you doing paper 6? :/

astarmathsandphysics:
When I get home

astarmathsandphysics:
2*4500=9kHz
3*10^8/10^3-3*10^8/10^4=270KHZ
270KHz/9KHZ=30

astarmathsandphysics:
See also this

http://www.electronics-radio.com/articles/radio/modulation/amplitude_modulation/am.php

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