MCQ
In photoelectric effect, electrons are ejected from metals,if the incident light has a certain minimum?
- AWavelength.
- ✓Frequency.
- CAmplitude.
- DAngle of incidence.
✓
Answer
Correct option: B.
Frequency.
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
1 atomic mass unit is equal to
If ${I_0}$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled
→Two charges each of 1 coulomb are at a distance 1 km apart, the force between them is
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell
Production of electricity from magnetism is called.
Which of the following is not a correct statement
The output voltage (taken across the resistance) of a $L-C-R$ series resonant circuit falls to half its peak value at a frequency of $200 \,Hz$ and again reaches the same value at $800 \,Hz$. The bandwidth of this circuit is ............. $\,Hz$
→The wavelength of light visible to eye is of the order of
Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with a constant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will
A cell of internal resistance $r$ is connected across an external resistance $n r$. Then the ratio of the terminal voltage to the emf of the cell is
→