- AChange in previous direction.
- BNot change.
- CChange in opposite direction.
- DNone of these.
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If work function of metal is 3eV then threshold wavelength will be
|
(a) 4125 Å |
(b) 4000 Å |
(c) 4500 Å |
(d) 5000 Å |
A polariser is used to
|
(a) Reduce intensity of light |
(b) Produce polarised light |
|
(c) Increase intensity of light |
(d) Produce unpolarised light |
With respect to air critical angle in a medium for light of red colour [ is q. Other facts remaining same, critical angle for light of yellow colour [
] will be
|
(a) θ |
(b) More than θ |
(c) Less than θ |
(d) |
Assertion : Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.
Reason : Resistances decreases due to decrease in temperature and so current through wire increases.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |