Physics 2. 6-8
If light traveled at the same speed through air and water, then there would be no refraction as a ray of light went from air to water.
true
Which of the following best describes "complementary" colors?
two colors that will form white light when mixed
Which of the following best describes the critical angle?
The minimum angle where none of the light beam escapes a medium.
Destructive interference
amplitudes of the two waves subtract from each other to form a smaller amplitude wave. (crest overlaps trough)
convex lens
light converges toward center point
alpha decay
nucleus emits two protons and neutrons
concave lens ray diagram rules
observer on same side of lens (object) -virtual image
Real images
occurs when actual light rays converge to form an image
Convex lens ray diagram rules
ray 3 passes through focal point on same side as object observer on opposite side of lens (object) -real image or virtual
Concave mirror ray diagram
real image inverted image
Which color of light is bent the least by a prism?
red
The greater the difference in index of refraction between the two media, the ____ the critical angle will be
smaller
Which type of radiation is the easiest to block?
alpha
reverberations
Garbled sounds caused by multiple reflections against a hard, flat wall
What happens to the atomic number of an atom when an alpha particle is emitted?
It decreases by two.
What happens to the atomic number of an atom when a beta particle is emitted?
It increases by one.
diffuse reflection
Light striking a rough surface will be reflected in many different directions.
Why won't a chain reaction occur in natural uranium?
Most natural uranium is U-238, which will not go through fission easily.
Who invented the reflecting telescope?
Newton
Which of the following best provides evidence that there is a nuclear strong force?
Scientists have seen that multiple protons that close together exert very strong electrical forces. There must be a very strong force to hold them together.
Which of the following best describes the image formed by a plane mirror?
The image is virtual and the same size as the object.
beat
This variation of the wave amplitude
diffraction
Waves bend around the edge of a barrier
warmer air causes light to travel...
faster and to bend
Constructive interference
amplitudes of the two waves add together to form a much larger amplitude. (crest overlaps crest)
What is a lens?
a curved piece of glass that allows light rays to diverge or converge
beta decay
a neutron is split into a proton and electron, and the electron is emitted.
index of refraction
a ratio of the speed of light in a vacuum compared to the speed of light in a substance
Why does a green shirt appear green?
because it reflects green light
a ray parallel to the principal axis will be
bent by the lens so it will converge or diverge at one of the focal points
a ray passing through a focal point will be
bent by the lens so that it's parallel to the principle axis
What is the radioactive isotope of carbon?
carbon 14
Iris
colored part of you eye that regulates the amount of light that enters
what lens do you use with a nearsighted eye?
concave lens
As discussed in the lesson, the three components of a nuclear reactor are
control rods, water, and nuclear fuel
concave mirror
converges light to focus
retina
converts light to signals for brain to process
What lens do you use with a farsighted eye?
convex lens
Which property of waves allows us to hear people in other rooms, even if we cannot see them?
diffraction
Which of the following is involved in the formation of a rainbow?
dispersion and reflection
convex mirror
diverges light
isotope
elements with the same number of protons but different numbers of neutrons
cornea
eye covering where light passes through
atomic bomb is caused by...
fission
plane mirror
flat mirror; we perceive image as behind glass
farsighted eye
focus behind the retina
nearsighted eye
focus in front of the retina
normal eye
focus on the retina
virtual image
formed when light appears to converge, but there isn't any real object (light) there
Our eyes perceive light as if it
is always moving in a straight line
concave lens
light spreads out
fusion
merging of two nuclei into a single, larger nucleus
blind spot
no sight possible where the retina's nerve bundle is tightly packed
A line perpendicular to a surface is called
normal
pupil
opening to eye
what does carbon dating work on?
organic items with organic tissue
The imaginary line which passes through the center of a lens is called the
principal axis
The bouncing back of a wave after striking a barrier is called
reflection
A "mirage" is caused by
refraction
The bending of a wave as it moves from one medium to another is called
refraction
Which of the following explains why the sky appears red sometimes at sunset?
scattering
convex mirrors allow you to..
see a wider angle (makes objects smaller
Which of the following optical phenomena involves reflection only?
solar pillar
How can temperature affect light?
temperature changes can affect the speed of that light.
angle of incidence
the angle between the wave and the normal as the wave approaches the barrier.
angle of reflection
the angle between the wave and the normal as the wave leaves the barrier, after being reflected
According to the law of reflection
the angle of incidence is always equal to the angle of reflection
Any angle greater than the critical angle will result in
the light being reflected back into the medium instead of leaving.
What defines a chemical element?
the number of protons
What is the "atomic number" of an element?
the number of protons
Fission
the splitting of a large nucleus into two or more smaller nuclei
Which color of light is bent the most in a prism?
violet
convex mirror ray diagram
virtual image upright
a ray passing through the center of a lens
will not change direction
Which of the following colors of light are complementary when mixed together?
yellow and blue
