Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern
|
(a) Will be more clear |
(b) Will contract |
|
(c) Will expanded |
(d) Will not be visualized |
(b) Will contract
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$\frac{1}{\text{r}}$
$\frac{1}{\text{r}^2}$
$\frac{1}{\text{r}^3}$
None of these.
The work function of a metal is 1.6 
J. When the metal surface is illuminated by the light of wavelength 6400 Å, then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant h = 6.4 
)
|
(a) 14 |
(b) 2.8 |
(c) 1.4 |
(d) 1.4 |
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in
|
(a) Reduction of charge on the plates and increase of potential difference across the plates |
|
(b) Increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates |
|
(c) Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates |
|
(d) None of the above |
The work done in turning a magnet of magnetic moment 'M' by an angle of 90° from the meridian is 'n' times the corresponding work done to turn it through an angle of 60°, where 'n' is given by
|
(a) 1/2 |
(b) 2 |
(c) 1/4 |
(d) 1 |
Three observers A, B and C measure the speed of light coming from a source to be 
and 
. The observer A moves towards the source, the observer C moves away from the source with the same speed. The observer B stays stationary. the surrounding space is vacuum every where. Then
(a) 
|
(b) 
|
(c) 
|
(d) 
|
