Q. 1414.0( 2 Votes )

# One Fermi is equal to 10–15 metre. The radius of a proton is 1.3 Fermis. Write the radius of a proton in metres in standard form.

Given 1 Fermi = 10-15 m

Radius of proton = 1.3 Fermis

Radius of proton in metres = 1.3 × 10-15

Moving 1 decimal to the right,

1.3 × 10-15 = 13 × 101 × 10-15

We know that by properties of exponents, am × an = am + n.

13 × 101 × 10-15 = 13 × 101-15

= 13 × 10-14

The radius of a proton in standard form is 13 × 10-14 m.

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