of
the 
particles were found to deflect at angles
> 50°. If one mole of particles were bombarded
on the gold foil, compute the number of particles
that would deflect at angles less than 50°.
Answer:
From mole concept,
1 mole ==6.022 x 1023 particles
(Mole concept was discussed in previous chapter) Number of
particles deflected at angles
greater than 50° (> 50°) = 1% (Given)
Number of a-particles
deflected at the angles less than
50° =100-1 = 99%
Actual number of particles deflected at the angles less
than 
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