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[Phy] wave MC

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wave MC

FOR 34 , 唔識計

FOR 35 , P,Q 又唔係人, 用咩有咩關係?

FOR 36 , increase frequency 又點??有咩關係?

FOR 37 , (2)冇得解嫁?

FOR 38 , 同frequency有咩關係 ??



請解答!!

thanks a lot!
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34. v= s/t =1.0.125 =8cms-1
v=f入
8=2入
入=4cm
at t=0, C is at highest position (i.e. 3/4 入 from A)
(C)

35
audiable sound, lower frequency, wavelength is larger
wavelength more compatiable with the size of the silt
larger angle of diffraction
signal can be detected at Q

same in water, speed is higher, wavelength is larger ......

reduce the size of silt
wavelength more compatiable with the size of the silt ......

36
decrease distance of D= decrease the seperation of nodal and antinodal lines
method 1: reduce wavelength (increase frequency = reduce wavelenth as wave speed remains)
method 2: increase the seperation between the sources

37 light guild can be made of any materials that is colourless and have a higher reflective index than the surrounding medium, the cirtical angle should be small enough so that light wave will not escape through refraction

38. audiable frequency is 20-20000Hz
the frequency is too low (lower than 20Hz)
2012 AL
AL Physics + AL Chemistry + AL Biology + AL Pure + CLC + UE

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