Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Which of the following statements about the SI unit of luminous intensity, the candela, is correct?
A
The candela is defined using the luminous efficacy of radiation at 540 x 10^12 Hz.
B
The candela is a measure of the total energy emitted by a light source.
C
The SI unit of luminous intensity is based solely on the mass of a body.
D
The candela is equivalent to lumens per watt in all contexts.
Correct Answer
Option A
Detailed Explanation
The candela is indeed defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 x 10^12 Hz, which is stated in the NCERT context.
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