Question

The \(E_1\) dose of UV lamp is 1 minute at 100 cm. The treatment has to be given with an \(E_2\) dose at 50 cm distance. What would be the duration of the \(E_2\) dose?

• A. 60 seconds
• B. 50.5 seconds
• C. 30.5 seconds
• D. 37.5 seconds

Hint:

Inverse Square Law: \[ I \propto \frac{1}{d^2} \] If distance halves → intensity becomes 4 times → time reduces accordingly. Also remember: \(E_2 \approx 2.5 \times E_1\).

Answer 1

The Correct Option is D