The sum of neutrons and protons defines the mass number of an isotope.
Answer: Option A
<u>Explanation:</u>
Isotopes of an element are defined as an element that possess the same number of protons but different number of neutrons in each atom. Hence the mass number in an isotope depends upon the two sub particles which are number of nucleons (i.e) the number of protons and neutrons. For example: carbon - 12 and carbon - 13 are examples of isotopes, the carbon element with mass number as 12 and 13.
The correct answer is evolution
three types
The three types of thermal expansions are Linear expansion , Superficial expansion and Cubical expansion.
Einstein's equations showed that matter could be converted into energy; and vice-versa
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Answer:
a) 
, b) 
Explanation:
a) According the Archimedes' Principle, the buoyancy force is equal to the displaced weight of surrounding liquid. The mass of the coal in the barge is:
b) The submersion height is found by using the equation derived previously:
The final submersion height is:
