Obtain an expression for the radius of Bohr orbit for H-atom.

State the law of parallelogram of vectors. (i) Obtain an expression for the magnitude of the resultant. (ii) Obtain an expression for the direction of the resultant.

Obtain an expression for the period of a satellite in a circular orbit round the earth OR Show that the square of the period of revolution of satellite is directly proportional to the cube of the orbital radius. OR Show that period of the satellite revolving around the earth depends upon mass of the earth

What is critical velocity? Obtain an expression for critical velocity of an orbiting satellite. On what factors does it depend?

Obtain an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level n to level (n-1) . For large n, shows that this frequency equals the classical frequency of revolution of the electron in the orbit.

Obtain an expression for critical speed of a satellite

Obtain the expression for the period of a magnet vibrating in a uniform magnetic field and performing S.H.M.

The energy associated with the first orbit in the hydrogen atom is -2.18 xx 10^-18 J atom^-2. Calculate the radius of Bohr's fifth orbit for hydrogen atom.

Obtain an expression for K.E. of a positively charged particle.

Calculate the frequency of revolution of the electron in the first Bohr orbit of H-atom, if the radius of the 1st Bohr orbit is 0.50 A^@ and the velocity of electron in the first orbit = 2.24 xx 10^6 m//s .

Obtain an expression for orbital magnetic moment of an electron rotating about the nucleus in an atom