Q1 : SPM 2003/P1
The diagram shows the fringe pattern produced from Young’s double slit experiment using the monochromatic red light source.
What happens to the fringes if monochromatic yellow light source is used?
A. The bright fringes are wider than the dark fringes B. The dark fringes are wider than the bright fringes C. The distance between consecutive fringes decrease D. The distance between consecutive fringes increase
Ok to answer this one..u must remember the sequence of visible light (pelangi) spectrum.
it starts with red,orange,yellow,green,blue and so on.
from red to blue...the wavelength is decreasing,
So yellow wavellength is smaller,... by referring equation λ=(ax) /D ...
it starts with red,orange,yellow,green,blue and so on.
from red to blue...the wavelength is decreasing,
So yellow wavellength is smaller,... by referring equation λ=(ax) /D ...
λ is directly proportional with x, thus x (distance between fringes)will also decrease.
Answer = C
Q2 : SPM 2004/P1
The diagram shows an interference pattern of two coherent water waves of sources, P and Q.
Which of the positions A, B, C or D, does destructive interference occur?
Which of the positions A, B, C or D, does destructive interference occur?
Answer: D
Q2 : SPM 2006/P1
Diagram 20 shows the interference patterns for water waves from two coherent source, S1 and S2.
Which of the following superposition of the waves at
shows the point Y?
answer= A (crest +trough = destructive interference)
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