The prefix 'femto' in SI units represents a factor of:
A. 10⁻¹²
B. 10⁻¹⁸
C. 10⁻¹⁵
D. 10⁻⁹
Answer: Option C
Solution (By JKSSB Mock Tests)
The SI prefix 'femto' denotes a factor of 10⁻¹⁵. This is standardized by the International Bureau of Weights and Measures. Common prefixes: pico (10⁻¹²), femto (10⁻¹⁵), atto (10⁻¹⁸), nano (10⁻⁹). Femtometer (10⁻¹⁵ m) is used in nuclear physics to measure atomic nuclei sizes. Exam tip: Remember the sequence: pico, femto, atto for decreasing scales. This question tests fundamental knowledge of SI prefixes essential for unit conversions in competitive examinations.
Explanation:
Power = work/time = 500/10 = 50 W. Watt = Joule/second. This is average power. Simple division. Higher power means faster rate of doing work.
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