Probably very easy but i don't understand (avg. angular speed)?

Question

A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, the time between two successive pulses is 0.044 s. Determine the average angular speed (in rad/s) of this pulsar.

Answer 1

The pulsar sweeps 2*pi rad in 0.044 s, therefore, the angular speed is
2*pi/0.044

142 rad/s

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