Physics Test

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How many neutrons does Th-228 have

138

Light behaves as a

Particle and Wave

What makes an element distinct?

The number of protons

The type of radiation that will penetrate farthest into a material is

a gamma ray

A photocell can be activated with blue light but not with red light. This is because blue light has

a higher frequency than red light.

Which type of radioactive decay occurs when the atomic number increases by one?

beta decay

If two protons are removed from an oxygen nucleus, the result is _____.

carbon

When a nucleus emits a beta particle, its atomic number

changes, but its mass number remains constant.

Energy released by the sun results from atomic nuclei

combining

Nuclear fission occurs when

electrical forces inside a nucleus overpower nuclear forces.

When light shines on a photosensitive material

electrons may be ejected.

The energy of a photon is directly proportional to its

frequency

The number of electrons ejected in the photoelectric effect depends on the light beam's

frequency

Which radiation has no electric charge associated with it?

gamma rays

All elements beyond uranium in the periodic table

have no isotopes

Large nuclei like uranium are radioactive because

none of the above

When thorium (90 protons) ejects a beta particle, the resulting nucleus has

none of the above

The atomic mass number of an atom refers to the number of

nucleons

At the center of every atom is a mass-filled region called the _____.

nucleus

In the photoelectric effect, the brighter the illuminating light on a photosensitive surface, the greater the

number of ejected electrons.

Isotopes are atoms of the same element that have a different

number of neutrons

The photoelectric effect best demonstrates the

particle nature of light

The nucleus of an atom consists of

protons and neutrons.

The atomic number of an atom or ion refers to the number of

protons.

Electrical forces within an atomic nucleus tend to

push it apart

The energy states available to an electron are

quantized.

The force that holds the nucleus together is the

strong force.

Nuclear fusion occurs typically in

the sun.

When U-235 splits, it usually emits

three neutrons

An alpha particle consists of

two protons and two neutrons.

Which of the following photons have the greatest energy?

ultraviolet

Generally speaking, the heavier a nucleus is, the more it is

unstable.

The primary fuel for a nuclear fusion reactor is

uranium.

Nuclear fusion releases energy when

very light nuclei fuse together.


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