Unit Test Answers

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Why would a doctor most likely restrict a patient’s contact with other people while the patient receives internal radiation?

The patient’s stress and anxiety would be eliminated.

High levels of radiation can diffuse through the patient’s skin.

Social contact would increase the effect of the radiation treatment.

Radioactive material can leave the patient’s body through saliva, sweat, and urine.

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Which type of radiation do people try to protect themselves from by wearing protective clothing that is made of aluminum?

alpha radiation

beta radiation

gamma radiation

photon radiation

After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. Which kind of decay has occurred, and how do you know?

alpha decay because alpha particles have no mass

beta decay because this kind of decay cannot change one element into another

alpha decay because it creates a new isotope of the same element

gamma decay because photons have no mass

The alpha decay of a radioactive nuclide (X) emits a He-4 nucleus and produces an isotope of . What is X?

Superscript 235 subscript 91 upper P a.

Superscript 235 subscript 93 upper N p.

Superscript 236 subscript 92 upper U.

Superscript 239 subscript 94 upper P u.

Which particles that make up an atom are involved in nuclear reactions?

protons only

protons and neutrons

electrons only

electrons and neutrons

If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next room? (Assume the wall between rooms is composed of concrete.)

None, because the wall will block the radiation.

The radiation will travel through the person’s body.

None, because the radiation will bounce off the person’s body.

The radiation will be totally absorbed by the person’s body.

Which radiation detection method creates visible trails that can show the direction of ionizing particles?

Geiger counter

scintillation counter

film badge

cloud chamber

Consider the three equations below.Which statement do these reactions best support?

Beta decay occurs only in certain atoms.

Alpha decay occurs only in certain atoms.

Chain reactions play important roles in the process of nuclear fission.

Nuclear fusion plays an important role in making elements that are heavier than helium.

Which represents the balanced nuclear equation for the beta plus decay of C-11?

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript plus 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 7 upper N plus superscript 0 subscript plus 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 7 upper N plus superscript 0 subscript negative 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript negative 1 e.

Consider the nuclear equation below.Which is the missing value that will balance the equation?

A large atom decays and emits a particle. After the reaction is complete, the atom’s mass has changed substantially. What kind of particle has most likely been emitted?

alpha particle

beta particle

positron

photon

A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide?

Superscript 27 subscript 60 upper C o.