The decay rate of an isotope is initially R0 but after one half-life has gone by, the rate isR0/2. At the end of the next half-life, the decay rate will be:

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?