೪9,

70.

71.

7೩

73.

The radius of the first orbit of hydrogen atom ‏قا‎ 5.29 × 10112. 110 780108 ೧? [೯ 800070 ೧೫015
of the hydrogen atom is ‏٭‎

(५) 1.89 10 (B) 1058 x 10-'m

ര 1587x 10! m (2) 21.16x 10" m

Which one of the following statements regarding photo-emission of electrons is correct?
(കു Photoelectric emission is instantaneous with the incidence of light
(B) Kinetic energy of electrons increases with the intensity of incident light
(८) Electrons are emitted when the wavelength of the incident light 18 above a certain
threshold
(D) Photoelectrons are emitted whenever a gas is irradiated with ultraviolet light

A particle is moving in the ecne-dimensional square well potential V(x)——O,H
Vix)=m, 11 > [. Its energy cigen values are :

‎n*h*‏ “عو ا
‎ந) இல ட‏ --- -- = ,& )4
‎द‏ و رج او & ‎മ‏
‎நப்‌ [கா்‌‏ وس
1 ا ‎ಹತಾ‏
‎கொய்‌ 81 उ‏ ست
‎Bose-Einstein statisties 18 applicable to systems of :‏
‎(ക half integral spin (B) electrons only‏
‎(C) protons only (D) integral spin‏

‎From a black body heated to 1000K the maximum intensity of emitted radiation is marked at
wavelength A. If the temperature is increased to 3000K, the intensity will be shifted ‏ما‎
‎wavelength given by a 2 where च 18:

‎(4) 3 0)

‎© 8 (0)

‎യുട லவ

‎The temperature of a gas is held constant while its volume is decreased. The pressure exerted
by the gas on the walls of the container increases beeause its molecules :
(A) strike the walle with higher velocities
(B) strike the walls with larger force
(C) are in contact with the wallg for a shorter time |
(D) strike the walls more frequently

‎71/2014 10 A