SELECT * FROM question_mgmt as q WHERE id=3974 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=182 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Atoms and Molecules define the atomic mass unit

Question:

Define the atomic mass unit.

Answer:

Atomic mass unit: Mass unit equals to exactly 1/12 th the mass of one atom of carbon-12 is known as an atomic mass unit.

Note:

Carbon-12: Standard reference for measuring atomic Masses. 

1 amu (atomic mass unit) = 1.66x10-24 g.


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