Which element will deflect more number of -particles at a scattering angle of 25-ZP-75-ZQ-80-ZR-85 and ZS-79

Given: Z_P=75,Z_Q=80,Z_R=85 and Z_S=79 ⇒ Z_R gt;Z_Q gt;Z_S gt;Z_P ...(1) We know that, the number of α particles scattering at an angle θ is proport ...

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Standard XII

Physics

Rutherford's Observations

Which element...

Question

Which element will deflect more number of $α -$ particles at a scattering angle of $25^{\circ}$ ?

$Z_{P} = 75, Z_{Q} = 80, Z_{R} = 85$ and $Z_{S} = 79$

P

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Q

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R

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S

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Solution

The correct option is C $R$
Given:

$Z_{P} = 75, Z_{Q} = 80, Z_{R} = 85$ and $Z_{S} = 79$

$\Rightarrow Z_{R} > Z_{Q} > Z_{S} > Z_{P} . . . (1)$

We know that, the number of $α -$ particles scattering at an angle $θ$ is proportional to the square of atomic number of target atom $i . e . N (θ) \propto Z^{2}$ .

Therefore, element $R$ will deflect more number of $α -$ particles at a scattering angle of $25^{\circ}$ .

Hence, option $(C)$ is the correct answer.

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Which element will deflect more number of α−particles at a scattering angle of 25∘? ZP=75,ZQ=80,ZR=85 and ZS=79

Which element will deflect more number of $α -$ particles at a scattering angle of $25^{\circ}$ ?

$Z_{P} = 75, Z_{Q} = 80, Z_{R} = 85$ and $Z_{S} = 79$