Chemistry please check

1. A Geiger counter measures radiation indirectly by measuring

flashes of light
electrons released by ionization
speaker static
curies

answer: electrons released by ionization

2. Reactor control rods are made of a substance that

absorbs neutrons
reflect neutrons
emits neutrons
slow down neutrons so they produce more fission.

answer: absorbs neutrons

3. The isotope U-238 is most likely to emit

a gamma ray
a beta particle
an alpha particle
It is not possible to predict

answer: an alpha particle

4. Besides U-235, another isotope that can undergo nuclear fission is

Pu-239
Th-230
U-238
Pb-210

answer: Pu-239

5. This type of radiation can easily pass through a human.

gamma
ultra-violet
beta
alpha

answer: gamma

6. The ejection of a beta particle from a nucleus results in

an increase of the mass number by four
a decrease of the atomic number by one
an increase of the atomic number by one
a decrease of the mass number by four

answer: an increase of the atomic number by one

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  3. A Geiger counter measures radiation indirectly by measuring

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