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PHYS 1260 EXAM 3 2025/2026 NEWEST ACTUAL EXAM WITH
COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
The frequency of induced voltage in a wire coil depends on A) the
frequency of current producing it. B) how frequently a magnet dips
in and out of the coil. C) the number of loops in the coil -
ANSWERS-B) how frequently a magnet dips in and out of the coil
Which travels with the greatest speed in a vacuum? A) Radio
waves B) Light waves C) X-rays D) Gamma rays E) [all have the
same speed] -ANSWERS-E) [all have the same speed]
Explanation — Fact: all electromagnetic radiation travels at the
same speed in vacuum
What is the frequency of an electromagnetic wave that has a
wavelength of 300,000 km? A) Less than 1 Hz B) 1 Hz C) More
than 1 Hz -ANSWERS-B) 1 Hz
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Explanation — We know c=f/\. After converting from km to m and
solving for f, we find choice B
Most of the waves in the electromagnetic spectrum are A) red
light. B) blue light. C) green light. D) invisible -ANSWERS-D)
invisible
Light travels from one place to another along a path of least A)
distance. B) time. C) effort. D) expense. E) complication. -
ANSWERS-B) time
When a pulse of white light is incident on a glass prism, the first
color to emerge is A) red. B) orange. C) green. D) violet -
ANSWERS-A) red
The index of refraction for crown glass, common in eyeglasses, is
1.52. The index of refraction of a particular plastic lens is 1.76.
Light bends more in the A) crown glass. B) plastic lens. C) [same
in each] D) [need more information] -ANSWERS-B) plastic lens
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Refraction results from differences in light's A) frequency. B)
incident angles. C) speed. D) [all of these] E) [none of these] -
ANSWERS-C) speed
Explanation — Please see Snell's Law from Fermat's Principle of
Least Time for details. This derivation gives you the impression
that a difference in speed is responsible for this phenomenon
In which material does light travel fastest? A) Glass B) Water C)
Plastic D) Air E) [same for all] -ANSWERS-D) Air
Explanation — This is why the index of refraction is so handy: It
compares the speed of light in a given material to that of the
reference value in vacuum, or n=c/v. An n close to 1 means ahigh
speed in that particular material. You can play around with this at
A Simple Variational Monte Carlo Method
The image of the "infinitely-far-away" Sun produced by a
converging lens appears A) between the lens and the focal point.
B) at the focal point. C) beyond the focal point -ANSWERS-B) at
the focal point
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A "pinhole camera" has no lens. The tiny pinhole opening ensures
that rays of light from different parts of an object A) overlap. B)
don't overlap. C) bend to a focus -ANSWERS-B) don't overlap
In a converging lens, objects infinitely far away are focused A) in
front of the focal point. B) at the focal point. C) beyond the focal
point -ANSWERS-B) at the focal point.
When taking a photo of a nearby flower, your camera lens should
be set A) closer than one focal length from the photosensitive
surface. B) farther than one focal length from the photosensitive
surface. C) to one focal length from the photosensitive surface -
ANSWERS-B) farther than one focal length from the
photosensitive surface
Which of the following can be projected onto a viewing screen? A)
Real image B) Virtual image C) [both of these] D) [neither of
these] -ANSWERS-A) Real image
PHYS 1260 EXAM 3 2025/2026 NEWEST ACTUAL EXAM WITH
COMPLETE QUESTIONS AND VERIFIED ANSWERS
|ALREADY GRADED A+|
The frequency of induced voltage in a wire coil depends on A) the
frequency of current producing it. B) how frequently a magnet dips
in and out of the coil. C) the number of loops in the coil -
ANSWERS-B) how frequently a magnet dips in and out of the coil
Which travels with the greatest speed in a vacuum? A) Radio
waves B) Light waves C) X-rays D) Gamma rays E) [all have the
same speed] -ANSWERS-E) [all have the same speed]
Explanation — Fact: all electromagnetic radiation travels at the
same speed in vacuum
What is the frequency of an electromagnetic wave that has a
wavelength of 300,000 km? A) Less than 1 Hz B) 1 Hz C) More
than 1 Hz -ANSWERS-B) 1 Hz
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Explanation — We know c=f/\. After converting from km to m and
solving for f, we find choice B
Most of the waves in the electromagnetic spectrum are A) red
light. B) blue light. C) green light. D) invisible -ANSWERS-D)
invisible
Light travels from one place to another along a path of least A)
distance. B) time. C) effort. D) expense. E) complication. -
ANSWERS-B) time
When a pulse of white light is incident on a glass prism, the first
color to emerge is A) red. B) orange. C) green. D) violet -
ANSWERS-A) red
The index of refraction for crown glass, common in eyeglasses, is
1.52. The index of refraction of a particular plastic lens is 1.76.
Light bends more in the A) crown glass. B) plastic lens. C) [same
in each] D) [need more information] -ANSWERS-B) plastic lens
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Refraction results from differences in light's A) frequency. B)
incident angles. C) speed. D) [all of these] E) [none of these] -
ANSWERS-C) speed
Explanation — Please see Snell's Law from Fermat's Principle of
Least Time for details. This derivation gives you the impression
that a difference in speed is responsible for this phenomenon
In which material does light travel fastest? A) Glass B) Water C)
Plastic D) Air E) [same for all] -ANSWERS-D) Air
Explanation — This is why the index of refraction is so handy: It
compares the speed of light in a given material to that of the
reference value in vacuum, or n=c/v. An n close to 1 means ahigh
speed in that particular material. You can play around with this at
A Simple Variational Monte Carlo Method
The image of the "infinitely-far-away" Sun produced by a
converging lens appears A) between the lens and the focal point.
B) at the focal point. C) beyond the focal point -ANSWERS-B) at
the focal point
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A "pinhole camera" has no lens. The tiny pinhole opening ensures
that rays of light from different parts of an object A) overlap. B)
don't overlap. C) bend to a focus -ANSWERS-B) don't overlap
In a converging lens, objects infinitely far away are focused A) in
front of the focal point. B) at the focal point. C) beyond the focal
point -ANSWERS-B) at the focal point.
When taking a photo of a nearby flower, your camera lens should
be set A) closer than one focal length from the photosensitive
surface. B) farther than one focal length from the photosensitive
surface. C) to one focal length from the photosensitive surface -
ANSWERS-B) farther than one focal length from the
photosensitive surface
Which of the following can be projected onto a viewing screen? A)
Real image B) Virtual image C) [both of these] D) [neither of
these] -ANSWERS-A) Real image
