Question
Evidence for the wave nature of light cannot be obtained from
|
(a) Reflection |
(b) Doppler effect |
(c) Interference |
(d) Diffraction |
✓
Answer
(a) Reflection
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From Maxwell’s hypothesis, a charging electric field gives rise to:
Photoelectric effect supports quantum nature of light because:
- There is a minimum frequency below which no photoelectrons are emitted.
- The maximum kinetic energy of photoelectrons depends only on the frequency of light and not on its intensity.
- Even when the metal surface is faintly illuminated the photoelectrons leave the surface immediately.
- Electric charge of the photoelectrons is quantized.
Absolute refractive indices of glass and water are 
and 
. The ratio of velocity of light in glass and water will be
|
(a) 4 : 3 |
(b) 8 : 7 |
(c) 8 : 9 |
(d) 3 : 4 |
Following operations can be performed on a capacitor:
X - connect the capacitor to a battery of emf $\in.$
Y - disconnect the battery.
Z - reconnect the battery with polarity reversed.
W - insert a dielectric slab in the capacitor.
→X - connect the capacitor to a battery of emf $\in.$
Y - disconnect the battery.
Z - reconnect the battery with polarity reversed.
W - insert a dielectric slab in the capacitor.
- In XYZ (perform X, then Y, then Z) the stored electric energy remains unchanged and no thermal energy is developed.
- The charge appearing on the capacitor is greater after the action XWY than after the action XYW.
- The electric energy stored in the capacitor is greater after the action WXY than after the action XYW.
- The electric field in the capacitor after the action XW is the same as that after WX.
Broadcasting antennas are generally
|
(a) Omnidirectional type |
(b) Vertical type |
(c) Horizontal type |
(d) None of these |
The electric field lines are far apart where electric field is:
Suppose the pressure at the surface of mercury in a barometer tube is P1 and the pressure at the surface of mercury in the cup is P2,
- P1 = 0, P2 = atmospheric pressure.
- P1 = atmospheric pressure P2 = 0
- P1 = P2 = atmospheric pressure.
- P1 = P2 = 0
A man can see only between 75 cm and 200 cm. The power of lens to correct the near point will be
|
(a) + 8/3 D |
(b) + 3 D |
(c) – 3 D |
(d) – 8/3 D |
Magnetic lines of force due to a bar magnet do not intersect because
|
(a) A point always has a single net magnetic field |
|
(b) The lines have similar charges and so repel each other |
|
(c) The lines always diverge from a single point |
|
(d) The lines need magnetic lenses to be made to intersect |
The adjoining figure shows a negatively charged electroscope. If a negatively charged rod is brought close to, but not touching, the knob, the two leaves will:
