Question

An electron and a proton are having same kinetic energy. Find ratio of their linear momentum. (mass of electron = \(9.1\times10^{-31}\) kg, mass of proton = \(1.67\times10^{27}kg)\) 

(1) \(1.67 \times10^{-3}\) m/s 

(2)  \(1.33 \times10^{-2}\) m/s 

(3)  \(1.23 \times10^{-2}\) kg.m/s

(4) \(2.33 \times10^{-2}\) kg.m/s

Answer 1

Correct Option is  (4)  \(2.33\times10^{-2}\) kg.m/s 

\(\frac{P^2_e}{2m_e}=\frac{P^2_p}{2m_p}\Rightarrow\frac{P_e}{P_p}=\sqrt\frac{m_e}{m_p}= 2.33\times10^{-2}\)