AP EAMCET · PHYSICS · Dual Nature of Matter
Initially a photon of wavelength \(\lambda_1\) falls on photocathode and emits an electron of maximum energy \(E_1\). If the wavelength of the incident photon is changed to \(\lambda_2\), the maximum energy of the electron emitted becomes \(E_2\). Then value of \(h c\) ( \(h=\) Planck's constant, \(c=\) velocity of light) is
- A \(h c=\frac{\left(E_1+E_2\right) \lambda_1 \lambda_2}{\lambda_2-\lambda_1}\)
- B \(h c=\frac{E_1-E_2}{\lambda_2-\lambda_1} \cdot\left(\lambda_1 \lambda_2\right)\)
- C \(h c=\frac{\left(E_1-E_2\right)\left(\lambda_2-\lambda_1\right)}{\lambda_1 \lambda_2}\)
- D \(h c=\frac{\lambda_2-\lambda_1}{\lambda_1 \lambda_2 E_2} \cdot E_1\)
Answer & Solution
Correct Answer
(B) \(h c=\frac{E_1-E_2}{\lambda_2-\lambda_1} \cdot\left(\lambda_1 \lambda_2\right)\)
Step-by-step Solution
Detailed explanation
From equation of photoelectric effect, we have \[ \begin{aligned} & E_1=\frac{h c}{\lambda_1}-W \\ & E_2=\frac{h c}{\lambda_2}-W \end{aligned} \] where, \(W\) is work function. \[ \begin{aligned} & E_1+W=\frac{h c}{\lambda_1} \\ & E_2+W=\frac{h c}{\lambda_2} \end{aligned} \]…
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
- A wire shaped in a regular hexagon of side 2 cm carries a current of 4A. The magnetic field at the centre of hexagon is
AP EAMCET 2024 Medium - If the range of a body projected with a velocity of \(60 \mathrm{~m} \mathrm{~s}^{-1}\) is \(180 \sqrt{3} \mathrm{~m}\), then the angle of projection of the body is
(Acceleration due to gravity \(=10 \mathrm{~m} \mathrm{~s}^{-2}\) )AP EAMCET 2025 Medium - A particle of mass \(1 \times 10^{-30} \mathrm{~kg}\) and electric change \(1.6 \times 10^{-19} \mathrm{C}\) has de-Broglie wavelength \(660 \mathrm{~nm}\). Then kinetic energy of this particle is
(Planck's constant, \(h=6.6 \times 10^{-34} \mathrm{~J}-\mathrm{s}\) )AP EAMCET 2022 Easy - In \(n-p-n\) transistor, in CE configuration:
1. The emitter is heavily doped than the collector.
2. Emitter and collector can be interchanged.
3. The base region is very thin but is heavily doped.
4. The conventional current flows from base to emitter.AP EAMCET 2004 Easy - The electric current \(i\) in the circuit shown is
AP EAMCET 2011 Easy - Two circular coils 1 and 2 are made from the same wire. The radius of the first coil is twice that of the second coil. What is the ratio of potential difference applied across them \(V_1 / V_2\), so that the magnetic field at their centre is the same?AP EAMCET 2021 Medium
More PYQs from AP EAMCET
- A battery with a \(12 \mathrm{~V}\) emf has an initial charge of \(80 \mathrm{~A} . h\). If the potential across the terminals stays constant until battery is completely discharged, then this battery can deliver energy at the rate of \(120 \mathrm{~W}\) for a timeAP EAMCET 2022 Hard
- Suppose \(\left(l_1, m_1, n_1\right)\) and \(\left(l_2, m_2, n_2\right)\) are the directional cosines of two lines and \(\theta\) is the angle between them and \(\cos \theta= \pm\left(l_1 l_2+m_1 m_2+n_1 n_2\right)\). Let \(A=(1,-2,3)\), \(B=(3,1,-3)\) and \(C=(-3,1,3)\) be the vertices of \(\triangle A B C\). Then, \(\cos A=\)AP EAMCET 2022 Hard
- In \(\triangle \mathrm{ABC}\), if \(b=2, c=\sqrt{3},\left\lfloor\mathrm{~A}=30^{\circ}\right.\), then its inradius \(r=\)AP EAMCET 2017 Medium
- In a \(\triangle A B C, C=90^{\circ}\). Then, \(\frac{a^2-b^2}{a^2+b^2}\) is equal toAP EAMCET 2010 Hard
- A coordinate complex contains \(\mathrm{Co}^{3+}, \mathrm{Cl}^{-}\)and \(\mathrm{NH}_3\). When dissolved in water, one mole of this complex gave a total of 3 moles of ions. The complex isAP EAMCET 2012 Easy
- Which of the following statements are correct?
(i) Inductive effect and resonance effect is possible in chlorobenzene.
(ii) Resonance effect dominates over inductive effect in anisole.
(iii) \(p\)-nitrobenzoic acid is less acidic than \(m\)-nitrobenzoic acid.
(iv) Diphenylamine is more basic than aniline.AP EAMCET 2021 Medium