According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of
(1) an alpha particle (3) an electron
(2) a gamma ray (4) a proton

 That would be (3) an electron

The correct answer would be b) volume versus temperature, because they are also directly proportional.

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