NTSE Stage 2 SAT 2018 Exam Question Paper

Question : 20 of 100

Marks: +1, -0

The correct order of increasing number of alpha particles passing undeflected through the foils of Au, Ag, Cu and Al of 1000 atoms thickness each in a simulated alpha particle scattering experiment of Rutherford would be

Au < Ag < Cu < Al
Al < Cu < Ag < Au
Au < Cu < Al < Ag
Ag < Cu < Al < Au

Validate

Solution:

Number of α-particles deflected

∝Z^2

That means more the atomic number, more will be the deflection. Thus, in gold, number of undeflected particles will be smallest. Hence option (1) is correct.

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