4. Which statement is correct about the half-lives of radioactive elements?(1 point)
Responses
The half-lives of radioactive elements vary within a similar range of a few seconds.
The half-lives of radioactive elements vary within a similar range of a few seconds.
The half-lives of radioactive elements with more neutrons become larger.
The half-lives of radioactive elements with more neutrons become larger.
The half-lives of radioactive elements with more neutrons become smaller.
The half-lives of radioactive elements with more neutrons become smaller.
The half-lives of radioactive elements vary from fractions of a second to billions of years.
The half-lives of radioactive elements vary from fractions of a second to billions of years.
Question 5
5. Nuclide X decays more quickly than nuclide Y. Based on this information, which of the following statements must be true?(1 point)
Responses
Nuclide Y is less abundant than nuclide X
Nuclide Y is less abundant than nuclide X
Nuclide Y has a larger half-life than nuclide X
Nuclide Y has a larger half-life than nuclide X
Nuclide Y has a shorter half-life than nuclide X
Nuclide Y has a shorter half-life than nuclide X
The daughter nuclides of X are more abundant than those of Y
The daughter nuclides of X are more abundant than those of Y
Question 6
6. What type of decay is shown above?
(1 point)
Responses
alpha decay
alpha decay
gamma decay
gamma decay
beta decay
beta decay
fusion decay
fusion decay
Question 7
7. In what way does a lead apron protect human cells from X-rays?(1 point)
Responses
It reduces the X-ray strength.
It reduces the X-ray strength.
The lead apron shields cells from exposure.
The lead apron shields cells from exposure.
The person is less likely to move.
The person is less likely to move.
It keeps the X-rays away from the mouth.
It keeps the X-rays away from the mouth.
Question 8
8. Why are children more susceptible to the effects of ionizing radiation?(1 point)
Responses
They have many growing cells that can easily have DNA damaged.
They have many growing cells that can easily have DNA damaged.
They move around a lot and pick up radiation.
They move around a lot and pick up radiation.
They do not know how to prevent exposure to radiation.
They do not know how to prevent exposure to radiation.
They get sick easily.
They get sick easily.
Question 9
9. What determines the severity of the effects of radiation on the human body?(1 point)
Responses
time and amount of exposure
time and amount of exposure
time of exposure only
time of exposure only
amount of exposure only
amount of exposure only
source of radiation
source of radiation
Question 10
10. Which of the following gives good evidence for the wave nature of EM radiation?(1 point)
Responses
matter waves
matter waves
interference patterns
interference patterns
existence of photons
existence of photons
the photoelectric effect
the photoelectric effect
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