Page 1 - ATOMS #141612120121
P. 1
HOME ASSIGNMENT(ATOMS)
1 Which of the following quantities has the same dimensions as Planck’s constant?
(a)angular momentum (b)torque (c)energy (d)pressure
2 When α-particles are sent through a thin gold foil, most of them go straight through the foil, because
(a)alpha particles are positively charged
(b)mass of α-particle is more than mass of electron
(c)most of the part of an atom is empty space
(d)alpha-particles move with high velocity
3 The ratio of radii of orbits corresponding to first and second excited states of hydrogen atom is
(a)1 (b)1:2 (c)2:3 (d)4:9
4 Which spectral series of hydrogen lie in UV region?
(a)Paschen (b)Lyman (c)Brackett (d)Balmer
5 _______________series lies in the visible region.
6 Total energy of electron in any orbit of an atom is_______. This indicates that electron________.
7 The angle of scattering for zero value of impact parameter b is_______________.
8 Alpha ray____________________led to the discovery of_________________.
9 Derive the Bohr’s quantisation condition for angular momentum of the orbiting electron in hydrogen
atom, using de Broglie’s hypothesis.
10
