DC Knowledge Check - nuclear reactions

What type of radioactive decay only releases energy?

• gamma decay
• alpha decay
• beta decay

Positively charged particles that consist of two protons and two neutrons are called.

• gamma decay
• alpha decay
• beta decay
• neutron emissions

An electron that is emitted during radioactive decay is a

• gamma decay
• alpha decay
• beta decay
• neutron emissions

What type of nucleus is formed in this type of decay? Type just the nuclear symbol.

What type of nucleus is formed in this type of decay? Type just the Chemical symbol.

The amount of time it takes for half of a sample (no matter the size of the sample) to undergo radioactive decay is called the what?

• half-life
• half-decay
• half-nucleus
• half-rate

Which of the following represents nuclear fusion? Type the correct letter, capitol only.

You have an isotope that has a half-life of one hour. How many half-lives have elapsed after exactly one hour? (number answer only)

You have an isotope that has a half-life of one hour. How many half-lives have elapsed after exactly one day? (number answer only)

The half-life of an isotope is 4 days. If at the start there are 1024 mg of this substance, how much will remain after 12 days? (numerical answer only)