HC Verma Class XII Physics Chapter 1– Introduction to Physics
Exercise : Solution of Questions on page Number : 08 Answer : 1 The speed of light in vacuum is 299,792,458 m/s. Then time taken by light to cover a distance of 1 metre in vacuum = 1299, 792, 458 s Hence, the metre is defined as the distance travelled by light in 1299, 792, 458 s. As 300,000,000 m/s is an approximate speed … Read more