Choose the correct alternative from the clues given at the end of the each statement:In the ground state of .......... electrons are in stable equilibrium,while in .......... electrons always experience a net force.(Thomson model/ Rutherford model)

Choose the correct alternative from the clues given at the end of the each statement: A classical atom based on .......... is doomed to collapse.( Thomson model/ Rutherford model)

Choose the correct alternative from the clues given at the end of the each statement: An atom has a nearly continuous mass distribution in a ..........but has a highly non-uniform mass distribution in ..........(Thomson Model/ Rutherford model)

Choose the correct alternative from the clues given at the end of the each statement: The positively charged part of the atom possesses most of the mass in .......... (Rutherford model/ Thomson model)

In which atomic model electrons in the ground state are in stable equilibrium?

Choose the correct alternative from the clues given at the end of the each statement: The size of the atom in Thomson model is..... the atomic size in Rutherford model( much greater than /no different from/ much less than.)

In a sample of H-atoms electrons are de-exicited from 4^(th) excited state to ground state. Which is/are correct statement ?

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Cyclotron is not used to accelerate electrons. Reason : Mass of electrons is very small.

Bohr's model of hydrogen atom In order to explain the stability of atom and its line spectra, Bohr gave a set of postulates: An electron in an atom revolves in certain circular orbit around the nucleus. These are the orbits for which mvr=(nh)/(2pi) In these allowed orbits, the electron does not radiate energy. When an electron jumps from higher energy level E_(n_2) to lower energy orbit E_(n_1) , radiation is emittd and frequency of emitted electron is given by v=(E_(n_2)-E_(n_1))/h . Further the radius of the n^(th) orbit of hydrogen atom is r=(n^2h^24piepsilon_0)/(4pi^2me^2) and energy of the n^(th) orbit is given by E_n=-13.6/n^2 eV . The ground state energy of hydroen atom is -13.6 eV. The KE and PE of the electron in this state are

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : the drift velocity of electrons in a conductor is very small, when its two ends are connected to a battery. Reason : It is because, as the electrons accelerated , they get scattered or defleted on suffering collisions against the positive ions in the conductor

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion :the electric bulb glows immedicately, when switched on. Reason : The drift velocity of electrons in a metallic wire is very high.