A sample of 2.0×1010 atoms that decay by alpha emission has a half-life of 100 minmin. How many alpha particles are emitted between t=50mint=50min and t=200mint=200min ?

Hello.the answer is  hydrosphere, geosphere, and biosphere  have a nice day

They cool it down and aluminum cools easily

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m