Question

How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm?

Answer 1

The light takes 4.73×10⁻²³ s to travel across the width of the Pb nucleus.

Step-by-step explanation:

Given :

Radius of Pb nucleus = 7.1 fm

Also, The conversion of fm into m is shown below:

1 fm = 10⁻¹⁵ m

The radius of Pb nucleus = 7.1×10⁻¹⁵ m

The width of Pb nucleus (diameter) = 2× Radius of the nucleus

Thus,

Width of Pb nucleus = 2×7.1×10⁻¹⁵ m = 14.2×10⁻¹⁵ m

The Speed of light = 3×10⁸ m/s

The formula for Speed is shown below:

`Speed=(Distance)/(Time)`

Time can be calculated from the above formula as:

`Time=(Distance)/(Speed)`

Applying values in the above formula as:

`Time=(14.2* 10^(-15) m)/(3* 10^(8) m/s)`

Time = 4.73×10⁻²³ s