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The kinetic energy per molecule of a gs at temperature T is ________.
(a) `(3/2)RT`
(b) `(3/2)K_BT`
(c) `(2/3) RT`
(d) `(3/2)("RT"/M)`
Concept: Temperature and Heat
A body cools from 80° C to 70° C in 5 minutes and to 62° C in the next 5 minutes. Calculate the temperature of the surroundings.
Concept: Temperature and Heat
Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol-1.
(Given: R = 8.314 J K-1 mol-1)
Concept: Chemical Thermodynamics and Energetic >> First Law of Thermodynamics
The specific heat capacity of water is
Concept: Specific Heat Capacities - Gases
What is perfectly black body ? Explain Ferry’s black body.
Concept: Qualitative Ideas of Black Body Radiation
State any two sources of errors in the meter-bridge experiment. Explain how they can be minimized.
Concept: Wheatstone Bridge
State the law of equipartition of energy and hence calculate the molar specific heat of mono-atomic and di-atomic gases at constant volume and constant pressure.
Concept: Law of Equipartition of Energy
Answer in brief:
A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed has work been done?
Concept: Heat Engine
An ideal monoatomic gas is adiabatically compressed so that its final temperature is twice its initial temperature. What is the ratio of the final pressure to its initial pressure?
Concept: Chemical Thermodynamics and Energetic >> First Law of Thermodynamics
When two objects are said to be in thermal equilibrium?
Concept: Thermal Equilibrium
Four resistances 4 Ω, 8Ω, XΩ and 12Ω are connected in a series to form Wheatstone’s network. If the network is balanced, the value of X is ______.
Concept: Wheatstone Bridge
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
Concept: Moving Coil Galvanometer
Draw a neat labelled diagram for the construction of 'cyclotron'
Concept: Cyclotron
Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 1014 Hz, find the wave number of light in glass.
[Velocity of light in air c = 3 x 108 m/s]
Concept: Reflection and Refraction of Plane Wave at a Plane Surface Using Wave Fronts
Wavelengths of two notes in the air are`[70/153]^m` and `[70/157]^m`. Each of these notes produces 8 beats per second with a tuning fork of fixed frequency. Find the velocity of sound in the air and frequency of the tuning fork.
Concept: Beats
In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10-27Kg, Charge on proton =1·6x10-19c).
Concept: Cyclotron
On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.
Concept: Huygens Principle
In Doppler effect of light, the term “red shift” is used for ______.
(A) frequency increase
(B) frequency decrease
(C) wavelength decrease
(D) frequency and wavelength increase
Concept: Beats
If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.
Concept: Cyclotron
Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
Concept: Beats
