Question

The dimensions of the quantity [g/l + 2k/m]^1/2 are the same as that of
(a) angle
(b) angular frequency
(c) time period
(d) linear velocity​

Answer 1

Answer:

b)........

................

Answer 2

Explanation:

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 =

1

299, 792, 458

s

Hence, the metre is defined as the distance travelled by light in

1

299, 792, 458

s.

As 300,000,000 m/s is an approximate speed of light in vacuum, it cannot be used to define the metre.

The distance travelled by light in one second is 299,792,458 m. This is a large quantity and cannot be used as a base unit. So, the metre is not defined in terms of second.