N5 Understanding Radioactivity and Absorbed Dose

What is the formula for calculating the activity of a radioactive substance?

• Number of nuclear disintegrations

• Time in seconds

• Activity in Bequerel (Bq)

• Energy absorbed

What is the unit of activity in the International System of Units (SI)?

• Gray (Gy)

• Joule (J)

• Bequerel (Bq)

• Kilogram (kg)

If a radioactive sample has 100 nuclear disintegrations in 5 seconds, what is its activity?

• 5 Bq

• 20 Bq

• 25 Bq

• 500 Bq

What is the formula for calculating the absorbed dose?

• Energy absorbed by material

• Mass of absorbing material

• Absorbed dose in Gray (Gy)

• Activity in Bequerel (Bq)

What is the unit of absorbed dose in the International System of Units (SI)?

• Bequerel (Bq)

• Joule (J)

• Gray (Gy)

• Kilogram (kg)

If 50 Joules of energy is absorbed by 2 kg of material, what is the absorbed dose?

• 25 Gy

• 50 Gy

• 100 Gy

• 0.5 Gy

What is the primary application of measuring absorbed dose in materials?

• To calculate the speed of light

• To determine the energy efficiency of a material

• To assess the potential biological effects of radiation

• To measure the temperature of a material

Which of the following is NOT a factor in calculating the activity of a radioactive substance?

• Number of nuclear disintegrations

• Time

• Mass of the substance

• Activity in Bequerel