Radioactivity

The unstable things in radioactive substance that emit radioactive rays

• nucleus

• neutron

• proton

• electron

SI unit for radioactivity

• Aq

• Bq

• Ci

• Fahrenheit

Unit used in radioactivity

• Aq

• Bq

• Ci

• Fahrenheit

time taken for the number of undecayed nuclei to be reduced to half of its original value

this is also known as

Which of the following are radioactive radiation in the form of radioactive ray?

• alpha, α

• theta, θ

• beta, β

• gamma, γ

• delta, δ

Which of the following are radioactive radiation in the form of particle?

• alpha, α

• theta, θ

• beta, β

• gamma, γ

• delta, δ

Which of the following are radioactive radiation?

• alpha, α

• theta, θ

• beta, β

• gamma, γ

• delta, δ

Who won Nobel Price because of discovery in radioactivity?

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Cobalt-60 decays to form Nickel-60 with half-life of 5 years.

Calculate the mass of Cobalt-60 after 20 years given its original mass is 16g.

The radioactive substance of P has a half-life of 2 hours. If the initial activity of P is 2000 Ci, what is the activity of substance after 8 hours?