According to Bohr's atom, velocity of electron is given by,
v∝ ...(i)
where, v = velocity of electron
where, v = velocity of electron
n = principal quantum number
From Eq. (i), velocity of electron is directly proportional to atomicnumber of atom, corresponding to positive charge. So, as Z increases velocity also increases.
Hence, statement I is false. Also, velocity of electron is inversely proportional to n i.e. as ‘n’ decreases velocity of electron increases.
So, statement II is true.