The ionization energy of Li⁺⁺ is equal to
The ionization energy of Li⁺⁺ is equal to
Options
(a) 9hcR (b) 6hcR (c) 2hcR (d) hcR
Correct Answer:
9hcR
Explanation:
Ionisation energy of Li⁺⁺ = 9hcR
Ionisation energy = RchZ² = Rhc(3)² = […]
KA2007
The volume of a nucleus is directly proportional to
The volume of a nucleus is directly proportional to
Options
(a) A (b) A³ (c) √A (d) A¹/₃
Correct Answer:
A
Explanation:
Radius of nucleus R = R₀ A¹/³ where R₀ = 1.2 × […]
In Raman effect, Stoke’s lines are spectral lines having
In Raman effect, Stoke’s lines are spectral lines having
Options
(a) frequency greater than that of the original line (b) wavelength equal to that of the original line (c) wavelength less than that […]
An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source 200V, 50 Hz, a choke has to be used in series with it. This choke should […]
Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively
Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 Ω each.They are connected in parallel with a cell of emf 4 V and negligible internal […]
A circuit area 0.01 m² is kept inside a magnetic field which is normal to its plane.
A circuit area 0.01 m² is kept inside a magnetic field which is normal to its plane. The magnetic field changes from 2 tesla to 1 tesla in 1 milli second. If the resistance of […]
A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m². If the density of charge carriers of the wire is 5×10²⁶ m⁻³, the drift velocity of the electrons will […]
Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they are in another energy level, n=n₂. They can emit 6 spectral lines. The orbital speed of the electrons in the two […]
During an adiabatic process, the cube of the pressure is found to be inversely
During an adiabatic process, the cube of the pressure is found to be inversely proportional to the fourth power of the volume. Then the ratio of specific heats is
Options
(a) 1 (b) […]
A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in […]