Question 30
What happens when waves pass through a gap equal to their
wavelength?
A
There is diffraction
and the wavelength decreases.
B
There is diffraction
and the wavelength stays the same.
C
There is no
diffraction and the wavelength decreases.
D There
is no diffraction and the wavelength stays the same.
Reference: Past Exam Paper – November 2018 Paper 12 Q28
Solution:
Answer: B.
When the gap is equal in width to the
wavelength of the wave, diffraction occurs. [C and D incorrect]
During diffraction, the wavelength stays
the same as the wave has not changed medium. It has only passed through a gap. The
distance between wavefronts remains constant. [B is correct]
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