Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions)

The ratio of de-Broglie wavelength of molecules of hydrogen and helium in two gas jars kept separately at temperature 27 o C and 127 o C respectively is The ratio of de-Broglie wavelength of molecules of hydrogen and helium in two gas jars kept separately at temperature 27 o C and 127 o C respectively [...]

The ratio of de – Broglie wavelength of alpha- particle to that of a proton being subjected to the same magnetic field so that the radii of their path are equal to each other assuming the field induction vector vec(B) is perpendicular to the velocity vectors of the alpha – particle and the proton is [...]

The wavelength K α ​ X−rays produced by an X−ray tube is 0.76 A. The atomic number of anticathode material is: The wavelength K α ​ X−rays produced by an X−ray tube is 0.76 A. The atomic number of anticathode material is: August 25, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP [...]

An electron in Bohr’s hydrogen atom has an energy of −3.4 eV. The angular momentum of the electron is : An electron in Bohr's hydrogen atom has an energy of −3.4 eV. The angular momentum of the electron is : August 25, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,

To decrease the cut-off wavelength of continuous X-ray by 25%, the potential difference across the X-ray tube the potential difference across the X-ray tube To decrease the cut-off wavelength of continuous X-ray by 25% August 25, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,

In a nuclear reaction, alpha+”_(7)N^(14)toX+p When nitrogen atoms are bombarded by 7.7 Me V alpha- particles, protons are ejected with a kinetic energy of 5.5 MeV. The Q- value of the reaction is -1.26 MeV (a) Find the atomic mass of X in amu, identify the element X. (b) Find the angle phi between the [...]

A particular type of nucleus whose decay constant is lambda is produced at a steady rate of p nuclei per second. Show that the number of nuclei N present t second after the production starts is N=(P)/(lambda)[1-e^(~lambdat)]. A gas hydrogen like atoms can absorb radiations of 68eV. Consequently A is ahead of B in phase [...]

Calculate the change in magnetic dipole moment when the electron in a H-atom makes a transition from the n=4 orbit to the n=3 orbit. Suppose that the atoms is in a magnetic field of induction. Calculate the change in energy when it makes the same transition and the corresponding change in frequency of the emitted [...]

A monochromatic beam of light (lamda = 4900A) incident normally upon a surface produces a pressure of 5 x 10^(-7) N/m^(-2) on it. Assume that 25% of the light incident in reflected and the rest absorbed. Find the number of photons falling per second on a unit area of thin surface A gas hydrogen like [...]

An electron of mass m is involved in head-on collision with an atom of mass M , initially at rest . As a result of the collision a certain amount of energy E is stored internally in the atom . What is the minimum initial velocity that the electron must have ? An electron of [...]