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## Homework Statement

Calculate the lower limit of the electron scattering time in a material placed in a magnetic field of 1 T which is necessary to observe cyclotron resonance. The electron effective mass in the material

is 0.06 ##m_o## (where ##m_o## is the free electron mass).

## Homework Equations

##\omega_c=\frac{eB}{0.06m_o}##

##\tau_{min}=\frac{2\pi}{\omega_c}##

## The Attempt at a Solution

So I basically substituted values into ##\omega_c## and then into the equation for ##\tau_c## i got ##\tau_c=2.14ps## whereas the answer says ##\tau_c=0.54ps##, have I gone wrong? or is the solution given wrong, because i have done it multiple times.