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Question 1 (5 points) Nuclear fission occurs when Question 1 options: we cut nuclei in two with a very small cutting device. electrical forces inside...

Question 1 (5 points)


Nuclear fission occurs when

Question 1 options:

we cut nuclei in two with a very small cutting device.

electrical forces inside a nucleus overpower nuclear forces.

one nucleus bumps into another causing a chain reaction.

a nucleus divides spontaneously, with no apparent reason.

none of the above 

Reactions that take place in a breeder reactor primarily change

Question 2 options:

ions into different ions.

elements into different elements.

molecules into different molecules.

all of the above

none of the above


Which element has the smaller critical mass, uranium-235 (which releases 2.5 neutrons per fission) or plutonium (which releases 2.7 neutrons per fission)?

Question 3 options:


Both would have the same critical mass.



A graph of nuclear mass per nucleon for all the elements

Question 4 options:

starts high, dips, and then slowly increases.

is a straight line.

is an ever-increasing graph.

starts low, peaks, and then slowly decreases.


A nuclear process that has relatively few radioactive byproducts is

Question 5 options:






both A and B


none of the above


If carbon were used as a nuclear fuel, it would best be

Question 6 options:



either fissioned or fused.


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

Question 7 options:


velocity of ejected electrons.


number of ejected electrons.


both A and B


none of the above


Which of the following photons have the greatest energy?

Question 8 options:


yellow light

red light

blue light

green light


A photosensitive surface is illuminated with both blue and violet light. The light that will cause more electrons to be ejected is the

Question 9 options:

blue light.

Not enough information is given.

violet light.

Both eject the same number.


Which of the following forms an interference pattern when directed towards two suitably spaced slits?

Question 10 options:




all of the above

none of the above


Planck's constant is a basic constant of nature that

Question 11 options:

is the foundation of the correspondence principle.

sets a lower limit on the size of things.

sets an upper limit on the size of things.

relates the energy of a photon to its momentum.

formulates the relationship between mass and energy.


An electron and a baseball move at the same speed. Which has the longer wavelength?

Question 12 options:

the baseball

the electron

Both have the same wavelength.


A hypothetical atom has four distinct energy states. Assuming all transitions are possible, how many spectral lines can this atom produce?

Question 13 options:



more than 6




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

Question 14 options:

neither stable nor unstable.




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

Question 15 options:

a beta ray.

a gamma ray.

an X-ray.

an alpha ray.

They all penetrate material the same distance.



Question 16 options:

can become part of a molecule called heavy water.

is an isotope of hydrogen.

consists of one proton and one neutron.

is stable.

all of the above


The reason carbon dating works is that

Question 17 options:

there is so much non-radioactive carbon dioxide in the air.

when a plant or animal dies, it stops producing oxygen.

plants and animals are such strong emitters of carbon-14.

after a plant or animal dies, it stops taking in fresh carbon-14.

none of the above


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

Question 18 options:

87 protons.

88 protons.

89 protons.

90 protons.

none of the above


The half-life of carbon-14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1 gram of a current sample, then the age of the old sample is

Question 19 options:

1,910 years.

716 years.

17,190 years.

none of the above


A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. 32 hours later, the counter registers 10 counts per second. What is the half-life of the isotope?

Question 20 options:

8 hours

16 hours

24 hours

32 hours

none of the above

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