AP EAMCET · PHYSICS · Dual Nature of Matter
Photons of wavelength \(\lambda\) emitted by a source of power \(P\) incident on a photo cell. If the current produced in the cell is \(I\), then the percentage of incident photons which produce current in the photo cell is. (where, \(h\) is Planck's constant and \(c\) is the speed of light in vacuum)
- A \(\frac{100 e P c}{\ln \lambda}\)
- B \(\frac{100 e P \lambda}{I h c}\)
- C \(\frac{100 / h \lambda}{e P_C}\)
- D \(\frac{100 / h c}{e P \lambda}\)
Answer & Solution
Correct Answer
(D) \(\frac{100 / h c}{e P \lambda}\)
Step-by-step Solution
Detailed explanation
In photoemission, only one electron can produce one photon. So, if only \(x \%\) of incident photons can produce electrons, then \[ I=\frac{n}{t}=\frac{100 \times I \times h c}{e P \lambda} \]
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- Water in a river \(20 \mathrm{~m}\) deep is flowing at a speed of \(10 \mathrm{~ms}^{-1}\). The shearing stress between the horizontal layers of water in the river in \(\mathrm{Nm}^{-2}\) is (Coefficient of viscosity of water \(=10^{-3} \mathrm{ \ SI}\) units)AP EAMCET 2004 Hard
- The force between two conducting spheres of same radius having charges \(+8 \mu \mathrm{C}\) and \(-4 \mu \mathrm{C}\) separated by some distance in air is \(F\). If the spheres are connected by a conducting wire and after some time the wire is removed, then the magnitude of the force between the two conducting spheres isAP EAMCET 2025 Medium
- A fully loaded Boeing air craft has a mass of \(3.3 \times 10^5 \mathrm{~kg}\). Its total wing area is \(500 \mathrm{~m}^2\). It is in level flight with a speed of \(960 \mathrm{~km} / \mathrm{h}\). Estimate the pressure difference between the lower and upper surfaces of the wings.AP EAMCET 2020 Medium
- A moving coil galvanometer of resistance 100 \(\Omega\) shows full scale deflection when a current of 100 micro-amperes passes through it. If it is intended to show full scale deflection when a current of 1 milliampere passes through it, the value of shunt resistance in ohms to be connected to the galvanometer is.AP EAMCET 2002 Medium
- Energy needed in breaking a liquid drop of radius \(R\), into \(n\) smaller drops each of radius \(r\), is [T- Surface tension of the liquid]AP EAMCET 2022 Medium
- A force of \(10 \mathrm{~N}\) acting at an angle on a particle produces a displacement of \((3 \hat{i}-4 \hat{\jmath}) \mathrm{m}\). Due to this force, if the kinetic energy of the particle is decreased by 25 joule, then the angle between the force and the displacement isAP EAMCET 2022 Easy
More PYQs from AP EAMCET
- If \(f(x)=x^{\mathrm{x}}\), then the interval in which \(f(x)\) decreases isAP EAMCET 2024 Medium
- Identify the correct statement.AP EAMCET 2015 Easy
- If \(\int \frac{d x}{x^{2022}\left(1+x^{2022}\right)^{1 / 2022}}=\frac{-\left(1+x^m\right)^{n / m}}{n x^n}+C\), then \(\mathrm{m}-\mathrm{n}=\)AP EAMCET 2022 Medium
- A heavy nucleus having mass number 200 gets disintegrated into two small fragments of mass numbers 80 and 120. If binding energy per nucleon for parent atom is \(6.5 \mathrm{MeV}\) and for daughter nuclii is \(7 \mathrm{MeV}\) and \(8 \mathrm{MeV}\) respectively, then the energy released in the decay will beAP EAMCET 2017 Easy
- Each edge of a cube is expanding at the rate of \(1 \mathrm{~cm} / \mathrm{sec}\). Then the rate (in \(\mathrm{cc} / \mathrm{sec}\).) of change in its volume, when each of its edge is of length \(5 \mathrm{~cm}\) isAP EAMCET 2017 Easy
- A magnetic field given by \(B(t)=\left(0.2 t-0.05 t^2\right) T\) is directed perpendicular to the plane of a circular coil containing 25 turns of radius \(1.8 \mathrm{~cm}\) and whose total resistance is \(5 \Omega\). The power dissipation at \(3 \mathrm{~s}\) is nearlyAP EAMCET 2021 Hard