MCQ
The work function for photoelectric effect:
- AIs different for different metals.
- BIs same for all metals.
- CDepends upon the intensity of incident light.
- DDepends upon the frequency of incident light.
✓
Answer
- Is different for different metals.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
|
(a) The electron stream will be pulled upward |
|
(b) The electron stream will be pulled downward |
|
(c) The electron stream will be retarted |
|
(d) The electron beam will be speeded up towards the right |
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is?
de-Broglie hypothesis treated electrons as
|
(a) Particles |
(b) Waves |
(c) Both ‘a’ and ‘b’ |
(d) None of these |
A wire is broken in four equal parts. A packet is formed by keeping the four wires together. The resistance of the packet in comparison to the resistance of the wire will be
|
(a) Equal |
(b) One fourth |
(c) One eight |
(d) |
Two wires of resistance R1 and R2 have temperature coefficient of resistance 
and 
, respectively. These are joined in series. The effective temperature coefficient of resistance is
|
(a) |
(b) |
(c) |
(d) |
The displacement at point P by two light waves emitted from this light source is $Y _1=5 \sin \omega t$ and $Y _2$ $=3 \cos \omega t$ respectively, then both the waves will be :
→Missing lines in a continuous spectrum reveal
|
(a) Defects of the observing instrument |
|
(b) Absence of some elements in the light source |
|
(c) Presence in the light source of hot vapours of some elements |
|
(d) Presence of cool vapours of some elements around the light source |
A parallel plate condenser is connected to a battery of emf 4 volt. If a plate of dielectric constant 8 is inserted into it, the potential difference on the condenser will be:
Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole
|
(a) V >> H |
(b) V << H |
(c) V = H |
(d) V = H = 0 |
In vacuum the speed of light depends upon
|
(a) Frequency |
(b) Wave length |
|
(c) Velocity of the source of light |
(d) None of these |