PHYS 1260 Exam 4 with Verified Answers 100% Pass
1. Superposition
and Interference
2. Superposition
and Interference
part 2
- same wave + same wave = reinforcement
- two opposite waves = cancellation
- two similar waves = partial cancellation
- interference patterns of overlapping waves fr...
1. Superposition - same wave + same wave = reinforcement
and Interference - two opposite waves = cancellation
- two similar waves = partial cancellation
- interference patterns of overlapping waves from 2 vibrat-
ing sources
- interference pattern = caused by interference b/w a pair
of waves
- constructive interference produces bright region where
waves reinforce each other (waves arriving in phase)
- destructive interference produces dark region where
waves cancel each other (waves arriving half a wavelength
out of phase)
- a monochromatic light into double slits produces an
interference pattern
- the phenomenon of interference occurs for = sound
waves + light waves --> interference is the property that
characterizes waves in general
2. Superposition - single-color thin-film interference = reflection from the
and Interference upper and lower surfaces of a wedge of air b/w 2 glass
part 2 plates
- interference colors by reflection from thin films = the thin
film of gasoline is just the right thickness to result in the
destructive interference of blue light
- diffraction grating = composed of a large number of close,
equally spaced slits for analyzing light source; produced
by spectrometers that disperse white light into colors
- if the thin film of gasoline was a bit thinner, the wave-
length to be canceled would be = shorter than that of blue
- if violet light were canceled by the double reflection of
sunlight from gasoline on a wet surface, the resulting color
would likely be = orange --> orange is the complementary
color of violet
- if you see the color blue reflected in the interference from
gasoline on water, and you lower your head so a greater
angle from the normal results, you'll likely see a color
having a wavelength = shorter than that of blue --> the
path through the gasoline would be longer, and a longer
, PHYS 1260 Exam 4 with Verified Answers 100% Pass
wavelength would be canceled; the result of a long wave
being canceled is a shorter wave
3. superposition interference colors = that colors are subtractive primaries
and interference = magnetas, yellows, and cyans
part 3
4. double-slit ex- - monochromatic light passing through 2 slits, a, forms an
periment interference pattern, b, shown graphically in c
- suppose we dim our light source so that, in effect, only 1
photon at a time reaches the barrier w/ the thin slits
- if film behind the barrier is exposed to the light for a very
short time, the film gets exposed = each spot represents
the place where the film has been exposed by a photon; if
the light is allowed to expose the film for a longer time, a
pattern of fringes begins to emerge
- if we cover one slit so that photons striking the photo-
graphic film can pass only through a single slit, the tiny
spots on the film accumulate to form a single-slit diffraction
pattern; we find that photons hit the film at places they
would not hit if both slits were open
5. how do photons - each single photon has wave properties as well as par-
traveling through ticle properties
one slit "know" - the photon displays different aspects at different time
that the other slit - a photon behaves as a particle when it is being emitted
is open and avoid by an atom or absorbed by photographic film or other
certain regions, detectors, and behaves as a wave in traveling from a
proceeding only source to the place where it is detected
to areas that will - so the photon strikes the film as a particle but travels to
ultimately fill to its position as a wave that interferes constructively
form an interfer-
ence pattern?
6. motion is relative - the place from which motion is observed and measured
is a *frame of reference*
- *an object may have different velocities* relative to differ-
ent frames of reference
- to measure the spd of an object, we first choose a frame
of reference and pretend that we are in that frame of
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