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If u1 and u2 are the units of a physical quantity in two different system of unit and, n1 and n2 are their numerical value then:
1. n1u1 = n2u2
2. n1u1 > n2u2
3. n1u1 < n2u2
4. None of these

1 Answer

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Best answer
Correct Answer - Option 1 : n1u1 = n2u2

CONCEPT:

Physical quantity:

  • A quantity that can be measured and by which various physical happenings can be explained and expressed in the form of laws is called a physical quantity.

Ex: length, mass, time, etc.

EXPLANATION:

  • A physical quantity is represented completely by its magnitude and unit.

⇒ Physical quantity = magnitude×unit = n×u

If n1 and n2 are the magnitudes of a physical quantity in two different systems of units.

Then n× u1 = n× u2

Where u1 and u2 are the units in two different systems of units.​

⇒ n1u1 = n2u2

  • Hence, option 1 is correct.

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