Question

When a value of q is kept constant, the value of m/e is proportional to which of the following when ‘m’ is the mass number, ‘e’ is the electric charge, ‘u’ is the DC potential, ‘v’ is the peak amplitude and ‘f’ is the frequency?

(a) u/v ratio

(b) u

(c) v

(d) f

The question was asked by my college professor while I was bunking the class.

This question is from Quadrupole Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation

Answer 1

Correct option is (c) v

For explanation I would say: When a value of q is kept constant, the value of m/e is proportional to ‘v’. By variation of rf amplitude the m/e ratio varies.