Which statement gives the current SI definition of the metre?

PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

Which statement gives the current SI definition of the metre? (a) Path travelled by light in air in a time interval of

1/299\,792\,458

second. (b) Distance between two fine lines engraved on a platinum–iridium bar at

0\,^{\circ}\text{C}

kept at Sèvres. (c) Path travelled by light in vacuum in a time interval of

1/299\,792\,458

second. (d)

1\,650\,763.73

wavelengths of orange–red radiation emitted by krypton-86 in vacuum.