phy problem

C

the diffraction effect would be larger when the wavelength of the waves is comparable with the gap distance.
As the wavelength of light is considerably smaller than the wavelength of sound,
its wavelength is too small under most circumference,
so the diffraction effect of sound would most likely more apparent than that of light.

C是對的。因為wavelength of light細，所以個gap要好細先可以有diffraction, 亦所以無咁明顯。
至於其他，A說的是沒關係的，DIFFRACTION只與WARELENGTH等東西有關，與TYPE OF WAVE無關；B都是沒關係的；D都是喇，與SPEED無關，主要都是WARELENGTH, SPEED是MEDIUM方面的問題；E是對的，但與DIFFRACTION無關。