A teacher sets up the apparatus shown to demonstrate a double-slit interference pattern on the screen.
Which change to the apparatus will increase the fringe spacing?
A decreasing the distance p.
B decreasing the distance q.
C decreasing the distance r.
D decreasing the wavelength of the light.
The diagram shows two sources of waves S1 and S2. The sources oscillate with a phase difference of 180°.
The sources each generate a wave of wavelength 2.0 cm. Each source produces a wave that has amplitude x0 when it reaches point P. What is the amplitude of the oscillation at P?
A 0
B x0/2
C x0
D 2x0
A two-source interference experiment uses the apparatus shown.
What is the main purpose of the single slit?
A to make a narrow beam of light
B to make the same amplitude of light incident on each slit
C to provide coherent light
D to provide monochromatic light
Which statement gives a condition that enables diffraction to occur?
A A source of waves moves towards a stationary observer.
B A wave is partially blocked by an obstacle.
C Two coherent waves are superposed.
D Two waves of equal speed and frequency are travelling through the same part of a medium in opposite directions.
Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm.
What is the path difference between the light waves from the two slits that meet at the second order dark fringe?
A 2.0 × 10^–7 m
B 4.0 × 10^–7 m
C 6.0 × 10^–7 m
D 8.0 x 10^-7 m
A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts.
After what time will some portion of the wavefront GH reach point P?
A 3λ/2c
B 2λ/c
C 3λ/c
D 4λ/c
In an experiment to demonstrate two-source interference of light, a beam of light is split into two beams using two slits 0.50 mm apart. These two beams are incident on a laboratory wall at a distance of 4.0 m. The wavelength of light is 550 nm.
How far apart are two adjacent interference fringes that are formed on the laboratory wall?
A 0.22 mm
B 0.44 mm
C 2.2 mm
D 4.4 mm
In a double-slit experiment the distance between the fringes, on a screen, was too small to measure.
What would increase the distance between the fringes?
A increasing the distance between the light source and the slits
B increasing the distance between the slits and the screen .
C increasing the distance between the slits
D increasing the frequency of the light source
A pattern of waves was observed without being able to view the source of the waves. The pattern is represented in the diagram.
What can cause this pattern?
A coherence only
B diffraction and interference
C diffraction only
D interference only
Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^–10 m?
A infra-red
B microwave
C ultraviolet
D X-ray
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