Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-SU2-0012 marksL1 FoundationCalculatorDouble slit

Light passes through two slits

0.50

mm apart. Fringes

1.2

mm apart are seen on a screen

1.0

m away. Calculate the wavelength, in nm.

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SA-9702-SU2-0031 markL1 FoundationCalculatorDiffraction & coherence

Two sources are coherent when they have

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SA-9702-SU2-0041 markL1 FoundationCalculatorDiffraction & coherence

For two coherent sources in phase, a bright fringe (maximum) occurs where the path difference is

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SA-9702-SU2-0051 markL1 FoundationCalculatorDiffraction & coherence

Two waves from in-phase sources meet with a path difference of

\tfrac\lambda2

. State their phase difference, in degrees.

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SA-9702-SU2-0061 markL1 FoundationCalculatorDiffraction & coherence

Diffraction through a gap is most noticeable when the gap width is

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SA-9702-SU2-0081 markL1 FoundationCalculatorDouble slit

In a double-slit experiment, the slit separation is doubled with everything else unchanged. State the factor by which the fringe spacing changes.

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SA-9702-SU2-0091 markL1 FoundationCalculatorDiffraction & coherence

Light from two separate, identical lamps does not produce an interference pattern because the lamps

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SA-9702-SU2-0101 markL1 FoundationCalculatorDouble slit

Ten fringe spacings measure

15

mm in total. Calculate the fringe spacing.

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SA-9702-SU2-0121 markL1 FoundationCalculatorDiffraction & coherence

A dark fringe in an interference pattern is caused by

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SA-9702-SU2-0022 marksL2 StandardCalculatorDouble slit

Light of wavelength

500

nm passes through slits

0.25

mm apart onto a screen

1.5

m away. Calculate the fringe spacing, in mm.

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SA-9702-SU2-0071 markL2 StandardCalculatorDiffraction & coherence

Two in-phase loudspeakers emit sound of wavelength

0.34

m. At point P the path difference is

0.85

m. Calculate the path difference in wavelengths.

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SA-9702-SU2-0113 marksL3 ExamCalculatorDouble slit

Microwaves of wavelength

3.0

cm pass through two gaps

15

cm apart. A detector moves along a line

1.2

m from the gaps. Calculate the distance between adjacent maxima, in cm.

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