This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
1. Which of the following pairs of instruments are null instruments? A null instrument measures a quantity by balancing it against a known quantity, indicating a zero (null) deflection when balanced. A potentiometer measures potential difference by balancing it against a known potential difference, using a centre-zero galvanometer to detect the null point (zero current). This pair works together as a null measurement system. While a Wheatstone bridge is also a null instrument, a spring balance is a direct-reading instrument, not a null instrument. The correct option is C. 2. A lethal dose of plutonium-239 isotope from radioactive waste is of mass 2.00 mg and has an activity of $4.59 × 10^6