Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see
|
(a) No interference |
|
(b) Interference with bright bands |
|
(c) Interference with dark bands |
|
(d) Interference in which width of the fringe will be slightly increased |
(d) Interference in which width of the fringe will be slightly increased
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The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to
|
(a) 13.6 eV |
(b) + |
(c) - |
(d) - |
An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
|
(a) Circular |
(b) Elliptical |
(c) Parabola |
(d) None of these |
Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
| (a) θ = 0° | (b) θ = 45° | (c) θ = 60° | (d) θ = 90° |
The current sensitivity of a moving coil galvanometer can be increased by
|
(a) Increasing the magnetic field of the permanent magnet |
|
(b) Increasing the area of the deflecting coil |
|
(c) Increasing the number of turns in the coil |
|
(d) a, b, c |
