Question

Fos n-atom ( n=1, x=1 )
( n_{n}=frac{n^{2} h^{2}}{4 pi^{2} m^{2} c^{2}} )
( varepsilon_{1}=frac{h^{2} m L C}{4 pi^{2} m e^{2}}=frac{left(6.6 times 10^{-34}right)^{2}}{4 times pi^{2} mathrm{me}^{2}} )
on substituting values of m ande we get ( &_{1}=0.529 mathrm{A}^{circ} )
If man in doubled ( n_{1}=frac{n^{2}}{4 pi^{2} 2 m e^{2}}=frac{1}{2} frac{h^{2}}{4 pi^{2} m e^{2}}=frac{1}{2} r_{1}=frac{1}{2}(0.529 mathrm{A}) )

# If the mass of electron is doubled, the radius of first orbit of H-atom become about (A) 0.529 Å (B) 0.265 Å (C) 1.058 Å (D) 0.32 A The speed of electron revolving in the 4th orbit of hydrogen like storien is 1004 kms The

Solution