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 |
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 |
(a) 1.8 eV
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Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by
|
(a) |
(b) |
(c) |
(d) |
Five resistances are connected as shown in the figure. The effective resistance between the points A and B is
|
(a) |
(b) |
(c) 15 Ω |
(d) 6 Ω |
In an LR-circuit, time constant is that time in which current grows from zero to the value (where
is the steady state current)
|
(a) |
(b) |
(c) |
(d) |
Electric charges of +10μC, + 5μC, -3μC and +8 μC are placed at the corners of a square of side
m. the potential at the centre of the square is
|
(a) 1.8 V |
(b) |
(c) 1.8 |
(d) 1.8 |