MCQ
The dependence of drift velocity on applied electric field E is:
- A$v_d$ will remain constant
- ✓$v_d \propto E$
- C$v_d \propto \frac{1}{ E }$
- Dnone of the above
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The forbidden energy band gap in conductors, semiconductors and insulators are
and
respectively. The relation among them is
|
(a) |
(b) |
|
(c) |
(d) |
If threshold wavelength for sodium is 6800Å then the work function will be
|
(a) 1.8 eV |
(b) 2.5 eV |
(c) 2.1 eV |
(d) 1.4 eV |
Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of the magnetic field B along the line XX’ is given by
|
(a) |
(b) |
(c) |
(d) |
The speed of an electron having a wavelength of
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |