Per NCERT §1.2 (revised SI 2018), the metre is defined so that the speed of light in vacuum equals which value?
A299 792 458 m/s
B3.00 × 10⁸ m/s only
C6.626 × 10⁻³⁴ m/s
D1.602 × 10⁻¹⁹ m/s
Answer & Solution
Correct answer: A. 299 792 458 m/s
NCERT Table 1.1: c = 299 792 458 m s⁻¹ exactly. Definition of the metre is fixed via this constant.
Related questions
Per NCERT Table 1.2, 1 STANDARD ATMOSPHERIC PRESSURE (atm) equals approximately which valuPer NCERT Table 1.2, 1 LITRE equals which SI volume?Per NCERT §1.2, the SI unit of ELECTRIC CURRENT is the ampere, defined via the elementary Per NCERT §1.2, the unit of SOLID ANGLE in SI is which?Per NCERT §1.2, the unit of PLANE ANGLE in SI is which?Per NCERT §1.2 (revised SI), the kelvin is defined by fixing which constant?Per NCERT §1.2 (revised SI), the kilogram is now defined via which fundamental constant?Per NCERT §1.2 (revised SI 2018), the second is defined via the caesium-133 hyperfine tran