Nuclear Physics Form 5

All are correct about radioactive decay except

• a random and spontaneous process

• process which an unstable nucleus become more stable

• emitting radioactive radiation

• have four types of radioactive radiation

Answer explanation

There are three types of radioactive radiation

Select all types of radioactive radiation

• Alpha particle

• Beta particle

• Delta ray

• Gamma ray

Alpha particle is actually

• helium nucleus

• fast-moving electron

• high-frequency electromagnetic wave

Beta particle is actually

• helium nucleus

• fast-moving electron

• high-frequency electromagnetic wave

Gamma ray is actually

• helium nucleus

• fast-moving electron

• high-frequency electromagnetic wave

True or false

During a radioactive decay, some nuclei can emit more than one radiation.

• True

• False

Half-life is

• time taken for a radioactive nuclei to decay half of its initial number.

• half of initial number when a radioactive nuclei decay.

• time taken for a radioactive nuclei to grow half of its initial number.

• half of initial number when a radioactive nuclei grow.

How the radioactive material is usually stored?

• In a thick container made of lead

• In a thick container made of gold

• In a thin container made of wood

• In a thin container made of glass

The unstable Uranium-238 will eventually become a stable

• Polonium-210

• Lead-206

• Lead-210

• Polonium-214

Uranium-238 have half-life of 5000 million years. If a scientist estimate that a rock with uranium-238 lost its half of mass, what is the age of the rock?

• 1000 million years

• 2500 million years

• 5000 million years

• 7500 million years