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physics past paper 9702_s04_1

beacon_of_light

beacon_of_light

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supermagic said:
q16,26,33 thx !
Click to expand...


Q16: At the top, v = o , so Ke = O ...option A is wrong ... by law of conservation of energy, total energy remains constant at every point i.e Ke + Pe = some constant value or 0...

Q26: Intensity = Power/ Area (E is power or energy per unit time)

intensity is directly proportional to (amplitude)^2
or
Power/Area is dir. proportional to (amp)^2
P/ (S A^2) = P/ (S A^2) use this formula, insert the values and get your answer...

Q33: Fall in voltage is caused by internal resistance... so V =IR ... you need current and internal resistance...
 
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