viva questions on astable multivibrator experiment

[nawaz]

An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined by Resistor Capacitor ( RC ) time constant

[ummachan419]

Is it possible to change time period of the wave form without changing R&C