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

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

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:

Time can be calculated from the above formula as:

Applying values in the above formula as:

Time = 4.73×10⁻²³ s

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.