AQA - A Level Physics - Waves #4

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Last updated: July 8, 2020

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First submitted	July 8, 2020
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Hint	Answer
What is a coherent source of light	Same frequency and constant phase difference
What is d in nλ=dsinθ	Distance between slits in a diffraction grating
What is D in w = λD/s	Distance between the double slits and the screen
What is a diffraction grating	A series of many, closely spaced parallel slits
What is the effect of decreasing wavelength at a single slit	Diffracted waves spread out less
What is the effect of reducing the size of a single slit	Diffracted waves spread out more
What is the effect of reducing the spacing of slits in a diffraction grating	Increases the angle of each beam
What is the fringe pattern for a single slit	Central fringe is twice the width of all others. Outer fringes are much less intense than the central maximum.
What is the fringe pattern for double slits	Spacing of fringes is constant (and intensity reduces gradually from the centre)
What happens if white light is used in the two slit experiment	Central fringe is white, inner fringes run have violet on the inside edge and red on the outside edge.
What is the maximum beam order from a diffraction grating	d/λ (rounded down to the nearest whole number)
What is n in nλ=dsinθ	Order of the beam
How many beams are produced by a diffraction grating?	2n+1 where n is the maximum beam order

Hint	Answer
What is the path difference for constructive interference	path difference = nλ (where n is an integer, n=0,1,2,3,4...)
What is the path difference for destructive interference	path difference = (n+1/2)λ (where n is an integer, n=0,1,2,3,4...)
What is the path length difference between adjacent slits along the nth order beam	n wavelengths
What produces a bright fringe	Constructive interference of the light from each slit
What produces a continuous spectrum of light	Hot objects such as filament lamps and the sun
What produces a dark fringe	Destructive interference of the light from each slit
What produces coherent, monochromatic light	Laser
what is s in w = λD/s	Distance between the double slits
Slit spacing (m) for a diffraction grating is equal to	1 / number of lines per metre
What was used by Young to provide coherent light for the two slits	Narrow single slit
What is w in w = λD/s	Fringe separation
What is a zero order beam	The central bright beam

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