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Three charges 4q, Q and q are in a straight line in the position of 0, l/2 and l respectively. The resultant force on q will be zero, if Q =
|
(a) – q |
(b) -2q |
(c) |
(d) 4q |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
|
(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |
The de-Broglie wavelength l
|
(a) is proportional to mass |
(b) is proportional to impulse |
|
(c) Inversely proportional to impulse |
(d) does not depend on impulse |
The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is
|
(a) |
(b) |
(c) |
(d) |
The ionisation energy of 10 times ionised sodium atom is
|
(a) 13.6 eV |
(b) 13.6 × 11 eV |
(c) |
(d) 13.6 × (11)2 eV |
A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
The spectrum of light emitted by a glowing solid is
|
(a) Continuous spectrum |
(b) Line spectrum |
(c) Band spectrum |
(d) Absorption spectrum |
