How much time does light take to react us from Alpha centuri.

what time does a crop take to mature?

The refractive index of water is 4//3 .How much time will light take to travel through a water column of length 500 m?

The time for half life period of a certain reaction A rarr Products is 1 hour. When the initial concentration of the reactant ‘A’ is 2.0 mol L^-1 , how much time does it take for its concentration to come from 0.50 to 0.25 mol L^-1 ? if it is a zero order reaction?

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20^(@)C ? The temperature of boiling water is 100^(@)C