PHYSICS 1260 EXAM 3 QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
Most of the waves in the electromagnetic spectrum are
invisible
Electromagnetic waves consist of
oscillating electric and magnetic fields
In free space, electromagnetic waves travel at a
single speed
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to
reach Earth would be the
both at the same time
Which of the following cannot travel in a vacuum (free space)?
Sound wave
The fact that you can see stars in the nighttime sky is evidence that
our atmosphere is transparent to visible light and light can travel in a vacuum
Light is reflected when
incident light is returned into the medium from which it came
When sunlight illuminates a page from your book it
reflects most of it and absorbs at the text lettering
Light travels from one place to another along a path of least
time
Fermat's principle applies to
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, reflection and refraction
The inversion of your image in a plane mirror is actually an inversion of
left-right and front-back
Refraction occurs when light passing from one medium to another
changes speed
When a light ray in air enters water at 15° from the normal, it
always bends toward the normal
Which are consequences of different speeds of light in different media?
Mirages, Rainbows, and Brilliant colors of diamonds
The type of lens that brings parallel light rays together is a
converging lens
The type of lens that spreads parallel light is a
diverging lens
Light travels slower in a lens having a
high index of refraction
Electromagnetic waves are
oscillating electric and magnetic fields
In vacuum, radio waves and visible light travel
at the same speed
Most of the electromagnetic spectrum is
invisible
Which cannot travel through vacuum?
Sound
You can see distant stars at night because
light travels through empty space
A photon's color in visible light is most directly linked to its
frequency
Compared at equal amplitudes, UV radiation has more energy per photon than red light
because it has greater
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ANSWERS GRADED A+ 2025/2026
Most of the waves in the electromagnetic spectrum are
invisible
Electromagnetic waves consist of
oscillating electric and magnetic fields
In free space, electromagnetic waves travel at a
single speed
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to
reach Earth would be the
both at the same time
Which of the following cannot travel in a vacuum (free space)?
Sound wave
The fact that you can see stars in the nighttime sky is evidence that
our atmosphere is transparent to visible light and light can travel in a vacuum
Light is reflected when
incident light is returned into the medium from which it came
When sunlight illuminates a page from your book it
reflects most of it and absorbs at the text lettering
Light travels from one place to another along a path of least
time
Fermat's principle applies to
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, reflection and refraction
The inversion of your image in a plane mirror is actually an inversion of
left-right and front-back
Refraction occurs when light passing from one medium to another
changes speed
When a light ray in air enters water at 15° from the normal, it
always bends toward the normal
Which are consequences of different speeds of light in different media?
Mirages, Rainbows, and Brilliant colors of diamonds
The type of lens that brings parallel light rays together is a
converging lens
The type of lens that spreads parallel light is a
diverging lens
Light travels slower in a lens having a
high index of refraction
Electromagnetic waves are
oscillating electric and magnetic fields
In vacuum, radio waves and visible light travel
at the same speed
Most of the electromagnetic spectrum is
invisible
Which cannot travel through vacuum?
Sound
You can see distant stars at night because
light travels through empty space
A photon's color in visible light is most directly linked to its
frequency
Compared at equal amplitudes, UV radiation has more energy per photon than red light
because it has greater
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