List the three types of radiation from least penetrating power to most penetrating power.
a
beta, alpha, gamma
b
alpha, gamma, beta
c
gamma, beta, alpha
d
alpha, beta, gamma
c) gamma, beta, alpha
The correct order of the three types of radiation from least penetrating power to most penetrating power is:
a) alpha, beta, gamma
The correct answer is option d: alpha, beta, gamma.
To determine the correct order of the three types of radiation, we need to understand their characteristics.
Alpha particles are positively charged particles consisting of two protons and two neutrons. They are relatively large and heavy compared to the other types of radiation. Due to their size and charge, alpha particles have low penetrating power. They can be stopped by a sheet of paper or a few centimeters of air.
Beta particles are high-energy, negatively charged electrons or positrons emitted during radioactive decay. They are much smaller and lighter than alpha particles, so they have greater penetrating power. Beta particles can pass through several millimeters of aluminum but are stopped by a few centimeters of plastic or wood.
Gamma rays are electromagnetic waves, similar to X-rays but with higher energy. They have no charge or mass and are highly penetrating. Gamma rays can travel through thick layers of material, requiring several centimeters of lead or a few meters of concrete to block their path.
Therefore, the correct order of the three types of radiation from least penetrating power to most penetrating power is alpha, beta, gamma.