Physics 2. 6-8

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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


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