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Wednesday, January 1, 2020

What happens when waves pass through a gap equal to their wavelength?


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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