nuclear physics

___________ is a process where an unstable nucleus becomes a more stable nucleus by emitting radioactive radiation

• radioactive decay

• half-life

• nuclear fission

• nuclear fusion

Which of the following is NOT in type of radioactive radiation?

• X-ray

Thorium-232 decays and emits gamma ray. which of the following is true about gamma ray?

I. Gamma ray is type of electromagnetic wave

II. Gamma ray is neutral

III. Gamma ray does not have energy

• I. and II.

• I. and III.

• II. and III.

Nuclear power stations are built near the sea because _______

• of the cooler surroundings

• water is used as a nuclear fuel

• a lot of water is used as coolant for the reactors

• more electricity can be generated

Radioactive material X has a half-life of 5 days. What is the number of days taken for the activity of X to reduce to 12.5% of its initial activity?

• 5 days

• 10 days

• 15 days

• 20 days

A sample of radioactive material has an initial activity of 240 s^-1 . If its half-life is 30 minutes, how much is its activity after 2 hours?

• 15 s^-1

• 30 s^-1

• 60 s^-1

• 120 s^-1

Nuclear energy is energy released from a ______ during nuclear reactions

• fast-moving proton

• fast-moving neutron

• fast-moving electron

• nucleus

The amount of energy released from nuclear fission depends on the

I. critical mass

II. speed of light in vacuum

III. mass deficit

• I. and II. only

• I. and III. only

• II. and III. only

• All the answer is correct

The walls of a nuclear reactor are made of ______

• iron

• concrete

• copper

• carbon

________ is a nuclear reaction in which a heavy nucleus is split into two or more smaller and lighter nuclei after being bombarded by fast-moving neutron.

• Radiaactive decay

• Nuclear fission

• Nuclear fusion

• half-life