Q6 Atomic structure

Q6 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

time taken to complete a single revolution

T = path distance / velocity

or

T = 2πr/v  (1)

here we assume that the linear velocity remains constant i every orbit.

so,

T1 = 2πr1/v  (2)

where r1 = R

and

T2 = 2πr2/v  (3)

where

r2 = 4R

 

thus, the ratio of time taken will be

T1/T2 = (2πr1/v) / 2πr2/v  

or

T1/T2 = 2πR/2π(4R) = 2πR/8πR

thus.

 

T1/T2 = 1/8

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