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Unformatted text preview: Chapt. 37 Diﬀraction Multiple-Choice Problems
037 qmult 00100 1 1 2 easy memory: diﬀraction deﬁned
1. Diﬀraction and interference are essentially the same physical phenomenon. It is customary
though to use the term diﬀraction when there are:
e) few sources.
many sources or even a continuum of them.
diﬀerent sources. 037 qmult 00200 1 4 2 easy deducto-memory: shadows
2. “Let’s play Jeopardy! For $100, the answer is: A large region of strong (but not necessarily
complete) destructive interference.”
is a substance, Alex?
a shadow, Alex?
a dark fringe of a two-slit interference pattern, Alex?
the path of the Huns, Alex?
the Shadow, Alex? 037 qmult 00300 1 1 1 easy memory: one-slit pattern
3. The one-slit diﬀraction pattern has:
e) a broad, bright central fringe.
a broad, dark central fringe.
three broad bright central fringes.
a narrow, dim central fringe.
a broad, shaggy central fringe. 037 qmult 00400 1 1 4 easy memory: one-slit zeros
4. The formula for the zeros of a one-slit diﬀraction pattern (for a slit of width a) is probably most
easily remembered (maybe because it so similar to the two-slit maxima formula) in the form:
e) a sin θ = n.
a cos θ = nλ.
a2 sin θ = nλ.
a sin θ = nλ.
sin θ = n. 037 qmult 00500 1 1 1 easy memory: enveloping patterns
5. The two-slit interference pattern (slit center separation d) will be enveloped by the one-slit
diﬀraction patterns of its two slits (widths a) if
a) a << d. ...
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- Fall '06