Question
- Write two main observations of photoelectric effect experiment which could only be explained by Einstein’s photoelectric equation.
- Draw a graph showing variation of photocurrent with the anode potential of a photocell.
✓
Answer
- There exists a threshold frequency below which no photoelectron is ejected.
- KE of electron depends linearly on frequency and is independent of intensity of radiation.
[only curve is essential to draw]
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
Discuss the similarities and differences of BiotSavart law with the Coulomb's law.
A gas thermometer measures the temperature from the variation of pressure of a sample of gas. If the pressure measured at the melting point of lead is 2.20 times the pressure measured at the triple point of water, find the melting point of lead.
Metallic (nonferromagnetic) and nonmetallic particles in a solid waste may be separated as follows. The waste is allowed to slide down an incline over permanent magnets. The metallic particles slow down as compared to the norunetallic ones and hence are separated. Discuss the role of eddy currents in the process.
Two monochromatic rays of light are incident normally on the face AB of an isosceles right-angled prism ABC. The refractive indices of the glass prism for the two rays ‘1’ and ‘2’ are respectively 1.35 and 1.45. Trace the path of these rays after entering through the prism.
Estimate the speed of vertically falling raindrops from the following data. Radius of the drops $= 0.02\ cm,$ viscosity of air $= 1.8 \times 10^{-4}$ poise$, g = 9.9\ m/s^2$ and density of water $= 1000\ kg/m^3$.
→Write statement of Lenz's law of electromagnetism. A 2 m long straight vertical wire is falling perpendicularly to horizontal component at speed of 5 $m / s$ in the magnetic field of earth of $0.3 \times 10^{-4} T$. Calculate the magnitude of instantaneous value of induced emf across the ends of the wire.
→Why is the de Broglie wavelength associated with macroscopic objects (cricket ball, car, etc.) not observed in daily life?
Describe briefly with the help of a circuit diagram, how the flow of current carriers in a p-n-p transistor is regulated with emitter-base junction forward biased and base-collector junction reverse biased.
A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more distinctly than the horizontal ones. What is this defect due to? How is such a defect of vision corrected?
The following figure shows the variation of intensity of magnetisation versus the applied magnetic field intensity, H, for two magnetic materials A and B:
- Identify the materials A and B.
- Why does the material B, have a larger susceptibility than A, for a given field at constant temperature?