# Which of the following is the energy after collision with a surface atom for a scattering angle of 90^o when Eo is the energy of the incident ion, M1 is the mass of the incident ion and M2 is the mass of the target surface?

+1 vote
101 views
Which of the following is the energy after collision with a surface atom for a scattering angle of 90^o when Eo is the energy of the incident ion, M1 is the mass of the incident ion and M2 is the mass of the target surface?

(a) Eo(M2-M1)/(M2+M1)

(b) Eo(M2+M1)/(M2-M1)

(c) Eo(M2×M1)/(M2+M1)

(d) Eo(M2-M1)/(M2×M1)

I got this question by my school principal while I was bunking the class.

Asked question is from Instrumentation of Ion Spectroscopy topic in division Electron and Ion Spectrometers of Analytical Instrumentation

by (1.3m points)
selected by

Correct option is (a) Eo(M2-M1)/(M2+M1)

The best I can explain: Eo(M2-M1)/(M2+M1) is the energy after collision with a surface atom for a scattering angle of 90^o. But, this is valid only when M1<M2.

+1 vote
+1 vote
+1 vote
+1 vote
+1 vote
+1 vote
+1 vote
+1 vote
+1 vote