Order of magnitude : Physics Quiz

Given number = a × 10^b
We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the given number is ‘b’

Given that: The electrostatic force = 4.3 × 10^-5 N.
We know that as the order of magnitude is the exponent of 10, therefore order of magnitude of the electrostatic force is -5.

Given that the diameter of the sun = 1.39 × 10⁹ m.
We know that the round off number 1.39 is 1, because it is less than 5.
Therefore diameter of the sun is the order is 10⁹ m.

Given that the diameter of hydrogen atom = 1.06 × 10^-10 m.
We know that the round off number 1.06 is 1, because it is less than 5.
Therefore the diameter of hydrogen atom is of the order of 10^-10.

Given that the mass of electron = 9.11 Given that the mass of electron = 9.11 × 10^-31 kg.
We know that the round off number of 9.11 is 10, because it is greater than 5.
Therefore order of the given number is 10⁵.

Given that the number is 87962. The given number may be written as 8.7962 × 10⁴.
We know that the round off number 8.7962 is 9, because it is greater than 5.
Therefore order of the given number is 10⁵.

The given number is = (2)¹⁰.
We know that (2)¹⁰ = 1024 = 1.024 × 10³.
We also know that the round off 1.024 is 1, because it is less than 5.
Therefore order of the given number is 10³.

Given that the thickness of window pan (x) = 3 mm = 3 × 10^-3 m and speed of light (c) = 3 × 10⁸ m-s^-1.
We know that time taken by sunlight to penetrate the window pan
(t) = x / c = 3 × 10^-3 / 3 × 10⁸ = 1 × 10^-11 s.
Therefore time-taken is of the order of 10^-11 s.