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What is crest and trough?

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A crest is a point on the wave where the displacement of the medium is at a maximum. A point on the wave is a trough if the displacement of the medium at that point is at a minimum
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Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?
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Which has more number of atoms, 100g of sodium or 100g of iron. How??

100g of sodium because of less atomic mass.
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If number of electrons in an atom is 8 and number of protons is also 8, then (i)what is the atomic number of the atom? and (ii) what is the charge on the atom?
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Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.
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