If was found that the winding radius of a tape on a cassette was reduced by half in a time `t_(1) = 20` min of operation. In what time `t_(2)` will the winding radius be reduced by half again ?

The new resistance of wire of R Omega , whose radius is reduced half, is

The half life of radium is 1600 years. After how much time will 1 g radium be reduced to 125 mg ?

The half-life of radium is 16000 yr, after how much time will 1 g radium be reduced to 125 mg?

A magnetic tape is wound on an emptyspool rotating at a constant angular velocity. The final radius r_(t) of the winding was found to be three times as large as the initial radius r_(1) ( Fig. ). The winding time of the tape is t_(1) . What is the time t_(2) required or winding a tape whose thickness is half that of the initial tape?

What would be the charge in radius of n^"th" orbit, if the mass of electron reduces to half of its original value ?

If earth radius reduces to half of its present value then the time period of rotation will become:

If initial concentration is reduced to 1//4^(th) in a zero order reaction , the time taken for half the reaction to complete