Two solid substances P and Q have atoms of mass MP and MQ respectively. There are nP and nQ
atoms per unit volume respectively.
It is found by experiment that the density of P is greater than that of Q.
Which deduction from this experiment must be correct?

Question

Two solid substances P and Q have atoms of mass MP and MQ respectively. There are nP and nQ
atoms per unit volume respectively.
It is found by experiment that the density of P is greater than that of Q.
Which deduction from this experiment must be correct?

anonymous · Answer

A) MP > MQ
B) nP > nQ
C) MPnP > MQnQ
D) MP/nP>MQ/nQ

anonymous · Answer

@hartnn  HELP

hartnn · Answer

know how to get density from mass and volume ?

anonymous · Answer

Density=Mass/Volume

anonymous · Answer

then

hartnn · Answer

for P, mass = MP, 
atoms / volume = nP 
so
density = MP*nP
so, what will be density of Q ?

anonymous · Answer

MQ*nQ

hartnn · Answer

yes, 
the density of P is greater than that of Q
 MP*nP > MQ*nQ

anonymous · Answer

But How did u get???
density = MP*nP

anonymous · Answer

Shouldn't it be MP/nP

hartnn · Answer

density = mass / volume = (mass of atoms )* number of atoms / Volume

hartnn · Answer

= (mass of atoms )* [number of atoms / Volume]

anonymous · Answer

Got it thanx.... @hartnn

hartnn · Answer

welcome ^_^