Arihant Physics by D.C Pandey

A wall consists of alternating blocks with length d and coefficient of thermal conductivity. The cross-sectional area of the blocks is the same. The equivalent coefficient of thermal conductivity of the wall between left and right is The following sets of values for Cv and Cp ​of an ideal gas have been reported by different [...]

A small quantity, mass m, of water at a temperature θ(in ∘C) is poured on to a large mass M of ice which is at its melting point. If c is specific heat capacity of water and L the latent heat of fusion of ice, then the mass of ice melted is given by A [...]

The following sets of values for Cv and Cp ​of an ideal gas have been reported by different students. The units are cal.mole^−1 K^−1. Which of these sets is most reliable? The following sets of values for Cv and Cp ​of an ideal gas have been reported by different students. The units are cal.mole^−1 K^−1. [...]

Half lives of two isotopes X and Y of a material are known to be 2×10^9 years and 4×10^9 years respectively. Planet was formed with equal number of these isotopes, and currently the material has 20% of X and 80% of Y by number on the planet. The current age of the planet is and [...]

Suppose the potential energy between electron and proton at a distance r is given by U = – (ke^2/3r^3) . Assuming Bhor’s Model to be valid for this atom if the speed of electron in nth Suppose the potential energy between electron and proton at a distance r is given by U = - (ke^2/3r^3) [...]

Consider the following energies 1. The minimum energy needed to excite a hydrogen atom from its ground state -E_(1). (2) Energy needed to ionize a hydrogen atom from ground state =E_(2) Consider the following energies 1. The minimum energy needed to excite a hydrogen atom from its ground state -E_(1). (2) Energy needed to ionize [...]

The half-life of 92 238 ​U undergoing α−decay is 4.5 ×10^9 years. The activity of the 1g sample of 92 238 ​U is? The half-life of 92 238 ​U undergoing α−decay is 4.5 ×10^9 years. The activity of the 1g sample of 92 238 ​U is? September 4, 2021 Category: Arihant Physics by D.C Pandey [...]

In a Coolidge tube, the potential difference used to accelerate the electrons is increased from 12.4 kV to 24.8 kV. As a result, the difference between the wavelengths of K_(alpha)-line and minimum wavelength increases to thrice its former value. The wavelength of the K_(alpha) line is (hc)/(e)=(12.4 KVA) In a Coolidge tube the difference between [...]

Assuming that about 20 MeV of energy is released per fusion reaction, 1H^2 + 1H^3 ⟶ 2He^4 . then the mass of 1H^2 consumed per day in a fusion reactor of power 1 MW will approximately be : 1H^2 + 1H^3 ⟶ 2He^4 . then the mass of 1H^2 consumed per day in a fusion [...]

Two identical photocathodes receive light of frequencies f1 ​and f2 . If the velocities of the photoelectrons (of mass m) coming out are v1 ​ and v2 , respectively, then respectively then Two identical photocathodes receive light of frequencies f1 ​and f2 . If the velocities of the photoelectrons (of mass m) coming out are [...]