Radioactivity Questions and Answers

The rest energy of an object is equal to what?

one-half its mass times the speed of light
its mass times the speed of light squared
O its mass times acceleration due to gravity
one-half its mass times its velocity squared
Physics
Radioactivity
The rest energy of an object is equal to what? one-half its mass times the speed of light its mass times the speed of light squared O its mass times acceleration due to gravity one-half its mass times its velocity squared
Deep in the core of the Sun, 620 million metric
tons of hydrogen nuclei are converted into 616
million metric tons of helium nuclei every
second. What happens to the "missing mass" in
the Sun's core?

The "missing mass" is converted to heat during an
exothermic chemical reaction that produces a
new chemical species.

The "missing mass" is transformed into energy in
a fission reaction.

The "missing mass" is transformed into energy in
a fusion reaction.

The "missing mass" is converted to heat during an
endothermic chemical reaction that produces a
new chemical species.
Physics
Radioactivity
Deep in the core of the Sun, 620 million metric tons of hydrogen nuclei are converted into 616 million metric tons of helium nuclei every second. What happens to the "missing mass" in the Sun's core? The "missing mass" is converted to heat during an exothermic chemical reaction that produces a new chemical species. The "missing mass" is transformed into energy in a fission reaction. The "missing mass" is transformed into energy in a fusion reaction. The "missing mass" is converted to heat during an endothermic chemical reaction that produces a new chemical species.
What number completes the missing part of this
nuclear equation?:
24 
     Na → 20F + 42α
11           __
Enter answer below
Physics
Radioactivity
What number completes the missing part of this nuclear equation?: 24 Na → 20F + 42α 11 __ Enter answer below
Nuclear reactions that occur in the Sun release a
tremendous amount of energy. Which statement
best describes the force that is responsible for
the release of this energy?

A. It is long ranged and holds the universe in place.
B. It is long ranged and it holds all the electrons in
chemical bonds.
C. It is short ranged and it holds protons and neutrons in the atom.
D. It is short ranged and holds the Sun and stars in the sky.
Physics
Radioactivity
Nuclear reactions that occur in the Sun release a tremendous amount of energy. Which statement best describes the force that is responsible for the release of this energy? A. It is long ranged and holds the universe in place. B. It is long ranged and it holds all the electrons in chemical bonds. C. It is short ranged and it holds protons and neutrons in the atom. D. It is short ranged and holds the Sun and stars in the sky.
The combination of two atomic nuclei into one,accompanied by a release of energy, is called:
A. fusion
B. chain reaction
C. fission
D. radioactive decay
Physics
Radioactivity
The combination of two atomic nuclei into one,accompanied by a release of energy, is called: A. fusion B. chain reaction C. fission D. radioactive decay
The Strong Nuclear Force is responsible for...

A. Keeping the electrons in orbit around the nucleus
B. Keeping the protons away from each other
C. Bonding the nuclei of two atoms to each other
D. Holding together protons and neutrons
Physics
Radioactivity
The Strong Nuclear Force is responsible for... A. Keeping the electrons in orbit around the nucleus B. Keeping the protons away from each other C. Bonding the nuclei of two atoms to each other D. Holding together protons and neutrons
Uranium-235 decays into thorium-231 by emitting an alpha particle. This process releases energy. Where does the energy come from?
Select one:
O The total mass of thorium-231 and an alpha particle is slightly less than the mass of uranium-. 235. This mass difference becomes energy.
O Thorium-231 plus an alpha particle has four more protons than uranium-235. This proton difference becomes energy.
O The mass of uranium-235 is slightly less than the total mass of thorium-231 and an alpha particle. This mass difference becomes energy.
O Uranium-235 has four more protons than thorium- 231 plus an alpha particle. This proton difference becomes energy.
Physics
Radioactivity
Uranium-235 decays into thorium-231 by emitting an alpha particle. This process releases energy. Where does the energy come from? Select one: O The total mass of thorium-231 and an alpha particle is slightly less than the mass of uranium-. 235. This mass difference becomes energy. O Thorium-231 plus an alpha particle has four more protons than uranium-235. This proton difference becomes energy. O The mass of uranium-235 is slightly less than the total mass of thorium-231 and an alpha particle. This mass difference becomes energy. O Uranium-235 has four more protons than thorium- 231 plus an alpha particle. This proton difference becomes energy.
In a hydrogen fusion reaction, two lighter hydrogen nuclei merge to form a heavier, more stable helium nucleus. The energy that is released in a hydrogen fusion reaction is
Select one:
O less than the energy released in chemical reactions of hydrogen.
O equal to the change in the mass of hydrogen during the reaction.
O the same as the energy released in the fission reaction of hydrogen.
O much greater than the energy released in a hydrogen chemical reaction.
Physics
Radioactivity
In a hydrogen fusion reaction, two lighter hydrogen nuclei merge to form a heavier, more stable helium nucleus. The energy that is released in a hydrogen fusion reaction is Select one: O less than the energy released in chemical reactions of hydrogen. O equal to the change in the mass of hydrogen during the reaction. O the same as the energy released in the fission reaction of hydrogen. O much greater than the energy released in a hydrogen chemical reaction.
Which of the following can be used to describe nuclear fission? Check all that apply.
energy is released as light
used in nuclear reactors
used in atomic bombs
not very efficient
Physics
Radioactivity
Which of the following can be used to describe nuclear fission? Check all that apply. energy is released as light used in nuclear reactors used in atomic bombs not very efficient
Which of the following would be considered the cons of using nuclear fission? Check all that apply.
the waste products include radioactive elements
produces air pollution from smoke stacks
there is a chance for large disaster accidents
it is used in nuclear weapon generation
Physics
Radioactivity
Which of the following would be considered the cons of using nuclear fission? Check all that apply. the waste products include radioactive elements produces air pollution from smoke stacks there is a chance for large disaster accidents it is used in nuclear weapon generation
What are control rods in a nuclear reactor?
they control the intensity of the chain reaction
they are used for emergency notification
they serve to fuel the nuclear reaction
they absorb energy from the reaction to transmit
Physics
Radioactivity
What are control rods in a nuclear reactor? they control the intensity of the chain reaction they are used for emergency notification they serve to fuel the nuclear reaction they absorb energy from the reaction to transmit
What is the rest energy of a neutron? (c = 2.9979 x 109 m/s, mn= 1.6749 x 10-27)
8.18 x 10-14 J
1.5053 x 10-10 J
2.73 x 10-22 J
1.5032 x 10-10 J
Physics
Radioactivity
What is the rest energy of a neutron? (c = 2.9979 x 109 m/s, mn= 1.6749 x 10-27) 8.18 x 10-14 J 1.5053 x 10-10 J 2.73 x 10-22 J 1.5032 x 10-10 J
Which of the following are considered the pros to using nuclear fusion? Check all that apply.
it happens at "normal" temperatures
it generates an abundant amount of energy
it is generally about 80% efficient
there is no dangerous waste
Physics
Radioactivity
Which of the following are considered the pros to using nuclear fusion? Check all that apply. it happens at "normal" temperatures it generates an abundant amount of energy it is generally about 80% efficient there is no dangerous waste
The half-life of Barium-139 is 4.96 x 103 seconds. A sample contains 3.21 x 10¹7 nuclei. What is the decay constant for this decay?
2.22 x 10-4 s-1
1.40 x 10-4 s-1
1.67 x 10-4 S-1
5.43 x 10-4 s-1
Physics
Radioactivity
The half-life of Barium-139 is 4.96 x 103 seconds. A sample contains 3.21 x 10¹7 nuclei. What is the decay constant for this decay? 2.22 x 10-4 s-1 1.40 x 10-4 s-1 1.67 x 10-4 S-1 5.43 x 10-4 s-1
The half-life of Silver-105 is 3.57 x 106 seconds. A sample contains 5.78 x 10¹7 nuclei. How much of the sample is left after 1.07 x 107 seconds?
3.61 x 1016 nuclei
2.89 x 10¹7 nuclei
7.23 x 10¹6 nuclei
1.45 x 10¹7 nuclei
Physics
Radioactivity
The half-life of Silver-105 is 3.57 x 106 seconds. A sample contains 5.78 x 10¹7 nuclei. How much of the sample is left after 1.07 x 107 seconds? 3.61 x 1016 nuclei 2.89 x 10¹7 nuclei 7.23 x 10¹6 nuclei 1.45 x 10¹7 nuclei
Which of the following are true regarding beta plus decay? (Select all that apply)
emits an antineutrino
emits a neutrino
the nucleus emits a high-energy electron
the nucleus emits a high-energy positron
Physics
Radioactivity
Which of the following are true regarding beta plus decay? (Select all that apply) emits an antineutrino emits a neutrino the nucleus emits a high-energy electron the nucleus emits a high-energy positron