Q 8 Atomic structure

Q 8 Atomic structure 13.6xl.6xto-" 6.62xto• x3x10S 3.4 xl.6x 10-10 3.4x1.6x10-19 4. 5. W'hich of the following curves may represent the speed of the electron in atom as a function of the principal quantum number 'n'? A sample of hydrogen atoms is irradiated with a light of photon energy 12.75 eV What is the minimum number Of atoms the sample should contain in order to get six different photons in its emission ectrum? 4 6. Electrons in two identical atoms move around the nucleus in circular orbits Of R & AR. The ratio of the time taken by them to complete one revolution is ; Jan 7. The change in energy' when an electron is transferred between a neutral potassium and a neutral bromine atom to produce a positively charged potassium cation and negatively charged bromine anion, K(g) + Br(g) —s Ve(g) + Br(g), is 93.6 kJ mol-l. The ionization energy of a potassium atom is 4.34 eV. Calculate the electron affinity of a neutral bromine atom. (B) -3.37 ev (C) -5.31eV (D) 3.37 Ev 8. A proton and an - particle are accelerated through the same potential difference. The ratio of their de Broglie wavelength is : 9. Light of wavelength shines on a metal surface with intensity X, and the metal emits•Y electrons persecond, of average energy Z. Select the correct statement. (A) if is halved, Z is unchanged Jej if X is increased, Y is not changed CHEMISTRY (B) if R is halved, Z will increase (D) if X is increased, Y will decrease

Debroglie wavelength:λ=h2mqVHere,m is mass of the particle,q is charge of the particle,V is potential differenceFor a given potential difference,λ α1mqλaλe=meqemaqa      =meqe4me2qe      =122

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