TS EAMCET · Physics · Dual Nature of Matter
Photons of energy 4.5 eV are incident on a photosensitive material of work function 3 eV. The de Broglie wavelength associated with the photoelectrons emitted with maximum kinetic energy is nearly
- A \(10 Å\)
- B \(5 Å\)
- C \(20 Å\)
- D \(15 Å\)
Answer & Solution
Correct Answer
(A) \(10 Å\)
Step-by-step Solution
Detailed explanation
\(K.E._{max} = E - \phi = 4.5 \text{ eV} - 3 \text{ eV} = 1.5 \text{ eV}\) \(\lambda = \frac{h}{\sqrt{2m K.E._{max}}} = \frac{6.626 \times 10^{-34} \text{ J s}}{\sqrt{2 \times 9.109 \times 10^{-31} \text{ kg} \times 1.5 \times 1.602 \times 10^{-19} \text{ J}}}\)…
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 ball of mass \(1 \mathrm{~kg}\) moves in a straight line with velocity \(v=c x^a\), where \(c=1\) (SI unit) and \(\alpha\) is a constant. If the work done by the net force during its displacement from \(\mathrm{x}=0\) to \(\mathrm{x}=4 \mathrm{~m}\) is \(128 \mathrm{~J}\), then the \(\alpha\) isTS EAMCET 2022 Medium
- What is the binding energy of whose atomic mass is Mass of proton Mass of neutron (Neglect the electron mass) (Assume )TS EAMCET 2020 Easy
- The terminal velocity of a liquid drop of radius ' \(r\) ' falling through air is \(v\). If two such drops are combined to form a bigger drop, the terminal velocity with which the bigger drop falls through air is (ignore any buoyant force due to air)TS EAMCET 2013 Medium
- A uniform sphere of radius \(R\) and mass \(m\) is placed on an inclined plane which makes an angle \(45^{\circ}\) to the horizontal. For which of the following value of coefficient of friction, the sphere rolls without slipping. Select incorrect option.TS EAMCET 2019 Medium
- Two stars of equal masses are orbiting in a circle of radius Their orbital time period is proportional toTS EAMCET 2021 Medium
- A cubical block of wood having mass of \(160 \mathrm{~g}\) has a metal piece fastened underneath as shown in the figure. Find the maximum mass of the metal piece which will allow the block to float in water. Specific gravity of wood is 0.8 and that metal is 10 and density of water \(=1 \mathrm{~g} / \mathrm{cc}\).
TS EAMCET 2020 Medium
More PYQs from TS EAMCET
- The pressure to be applied to the ends of a steel cylinder to keep its length constant upon raising its temperature by \(100^{\circ} \mathrm{C}\) is (thermal expansion coefficient, \(\alpha=11 \times 10^{-6} / \mathrm{K}\), Young's modulus \(=200 \mathrm{GPa}\) )TS EAMCET 2018 Easy
- The de-Broglie wavelength of the electron in the first Bohr orbit of the hydrogen atom isTS EAMCET 2020 Easy
- If \(\mathrm{A}, \mathrm{B}\) and C are three different physical quantities with different dimensional formulae, then the combination which can never give a proper physical quantity isTS EAMCET 2025 Medium
- In atomic scale the weakest force in nature isTS EAMCET 2020 Easy
- A car starts at time \(t=0\) from an initial speed of \(10 \mathrm{~m} / \mathrm{s}\) and accelerates uniformly with \(2 \mathrm{~m} / \mathrm{s}^2\) on a straight road for time \(0 \leq t \leq 10 \mathrm{~s}\). Let \(S_1\) and \(S_2\) be the distance covered by the car in time \(3 \leq t \leq 4 s\) and \(4 \leq t \leq 5 s\) respectively. The ratio \(\frac{S_2}{S_1}\) isTS EAMCET 2022 Easy
- The magnetic induction and the intensity of magnetic field inside an iron core of an electromagnet are \(1 \mathrm{~Wb} \mathrm{~m}^{-2}\) and \(150 \mathrm{Am}^{-1}\), respectively. The relative permeability of iron is \(\left(\mu_0=4 \pi \times 10^{-7}\right.\) henry \(\left./ \mathrm{m}\right)\)TS EAMCET 2004 Easy