Is radiation intensity inversely proportional to the square of the distance from the source?

Is radiation intensity inversely proportional to the square of the distance from the source?

• A. True
• B. False
• C. Only for gamma radiation
• D. Only for low energy radiation

Answer: (A)

Radiation intensity is indeed inversely proportional to the square of the distance from the source, a principle commonly known as the inverse square law. This law states that as you move further away from a point source of radiation, the intensity of that radiation decreases with the square of the distance. It is a fundamental concept in physics that applies to various types of radiation, including gamma rays, X-rays, and other forms of electromagnetic radiation. This relationship arises because as the distance from the source increases, the same amount of radiation is spread over a larger area, resulting in a decrease in intensity. For instance, if you double the distance from the source, the intensity is reduced to one-fourth of its original value. Thus, the correct answer confirms the general applicability of this principle across different types of radiation, ensuring a consistent understanding of how distance affects radiation exposure. The other choices incorrectly limit this relationship to specific types of radiation or suggest it might not hold true broadly.

Radiation intensity is indeed inversely proportional to the square of the distance from the source, a principle commonly known as the inverse square law. This law states that as you move further away from a point source of radiation, the intensity of that radiation decreases with the square of the distance. It is a fundamental concept in physics that applies to various types of radiation, including gamma rays, X-rays, and other forms of electromagnetic radiation.

This relationship arises because as the distance from the source increases, the same amount of radiation is spread over a larger area, resulting in a decrease in intensity. For instance, if you double the distance from the source, the intensity is reduced to one-fourth of its original value.

Thus, the correct answer confirms the general applicability of this principle across different types of radiation, ensuring a consistent understanding of how distance affects radiation exposure. The other choices incorrectly limit this relationship to specific types of radiation or suggest it might not hold true broadly.