When the object is self-luminous, the resolving power of a microscope is given by the expression
|
(a) |
(b) |
(c) |
(d) |
When the object is self-luminous, the resolving power of a microscope is given by the expression
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(a) |
(b) |
(c) |
(d) |
(a)
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When a thin metal plate is placed in the path of one of the interfering beams of light
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(a) Fringe width increases |
(b) Fringes disappear |
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(c) Fringes become brighter |
(d) Fringes becomes blurred |
If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be
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(a) |
(b) |
(c) |
(d) |
Assertion : The back emf in a dc motor is maximum when the motor has just been switched on.
Reason : When motor is switched on it has maximum speed.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 . Then the electrical potential produced by the nucleus at the position of the electron is
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(a) – 13.6 V |
(b) – 27.2 V |
(c) 27.2 V |
(d) 13.6 V |
Which of the following is deflected by electric field
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(a) X-rays |
(b) γ -rays |
(c) Neutrons |
(d) α -particles |