JEE Mains · Chemistry · STD 11 - 2. structure of atom
If the wavelength for an electron emitted from \(H\) atom is \(3.3 \times 10^{-10}\,m\), then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is \(.......\)times. (Nearest integer). [Given \(: h =6.626 \times 10^{-34}\,Js\),Mass of electron \(=9.1 \times 10^{-31}\) ]
- A \(1\)
- B \(3\)
- C \(2\)
- D \(0\)
Answer & Solution
Correct Answer
(C) \(2\)
Step-by-step Solution
Detailed explanation
\(\lambda=\frac{ h }{\sqrt{2 mK }}\) \(K =\frac{ h ^{2}}{2 m \lambda^{2}}\) \(K =\frac{ h ^{2}}{2 m \lambda^{2}}=\frac{43.9 \times 10^{-68}}{2 \times 9.1 \times 10^{-31} \times 10.89 \times 10^{-20}}\) \(K =2.215 \times 10^{-18}\) \(E _{ abs }= E _{\text {req }}+ K\)…
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 Chemistry
- For the decomposition of the compound, represented as \(N{H_2}COON{H_4}\left( s \right) \rightleftharpoons 2N{H_3}\left( g \right) + C{O_2}\left( g \right)\) the \(K_p\, =2.9\times10^{- 5}\, atm^3\) . If the reaction is started with \(1\, mol\) of the compound, the total pressure at equilibrium would be............\(\times10^{-2}\, atm\)JEE Mains 2014 Hard
- The observed osmotic pressure for a \(0.10\, M\) solution of \(Fe(NH_4)_2(SO_4)_2\) at \(25\,^oC\) is \(10.8\, atm\). The expected and experimental ( observed) values of van't Hoff factor \((i)\) will be respectively: \((R\,= 0.082\, L\, atm\, k^{-1}\, mol^{-1})\)JEE Mains 2014 Hard
- Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over timeJEE Mains 2020 Hard
- The decreasing order of electrical conductivity of the following aqueous solutions is
\(0.1\, M\) Formic acid \((a)\)
\(0.1\, M\) Acetic acid \((b)\)
\(0.1\, M\) Benzoic acid \((c)\)JEE Mains 2019 Hard - The correct order of molar heat capacities measured at \(298\text{ K}\) and \(1\text{ bar}\) is :JEE Mains 2026 Medium
- For hydrogen atom, energy of an electron in first excited state is \(-3.4 \mathrm{eV}, \mathrm{KE}\). of the same electron of hydrogen atom is \(\mathrm{x} \mathrm{eV}\). Value of \(\mathrm{x}\) is _______\(\times 10^{-1} \mathrm{eV}\). (Nearest integer)JEE Mains 2024 Medium
More PYQs from JEE Mains
- A light planet is revolving around a massive star in a circular orbit of radius \(R\) with a period of revolution \(T\). If the force of attraction between planet and star is proportional to \(\mathrm{R}^{-3 / 2}\) then choose the correct option.JEE Mains 2024 Hard
- The value of \(\mathrm{k} \in \mathbb{N}\) for which the integral \(I_n=\int_0^1\left(1-x^k\right)^n d x, n \in \mathbb{N} \text {, satisfies } 147 I_{20}=148 I_{21}\) is :JEE Mains 2024 Hard
- When a particle of mass \(m\) is attached to a vertical spring of spring constant \(k\) and released, its motion is described by \(y ( t )= y _{0} \sin ^{2} \omega t ,\) where \('y'\) is measured from the lower end of unstretched spring. Then \(\omega\) isJEE Mains 2020 Hard
- Let \(\mathrm{A}\) and \(\mathrm{B}\) be two square matrices of order \(3\) such that \(|A|=3\) and \(|B|=2\). Then \(\left|\mathrm{A}^{\mathrm{T}} \mathrm{A}(\operatorname{adj}(2 \mathrm{~A}))^{-1}(\operatorname{adj}(4 \mathrm{~B}))(\operatorname{adj}(\mathrm{AB}))^{-1} \mathrm{AA}^{\mathrm{T}}\right|\) is equal to :JEE Mains 2024 Hard
- An ideal gas undergoes a process maintaining relation between pressure \((P)\) and volume \((V)\) as \(P = P_o\left(1 + \left(\dfrac{V_o}{V}\right)^2\right)^{-1}\), where \(P_o\) and \(V_o\) are constants. If two samples \(A\) and \(B\) (two moles each) with initial volumes \(V_o\) and \(3V_o\) respectively undergo above mentioned process and attain same pressure, then the difference at the temperatures of these samples, \(T_B - T_A\) is _____. (\(R = \) gas constant)JEE Mains 2026 Hard
- Two masses \(m\) and \(\frac{m}{2}\) are connected at the two ends of a massless rigid rod of length \(l\). The rod is suspended by a thin wire of torsional constant \(k\) at the centre of mass of the rodmass system (see figure). Because of torsional constant \(k\), the restoring torque is \(\tau = k\,\theta \) for angular displacement \(\theta \). If the rod is rotated by \(\theta _0\) and released, the tension in it when it passes through its mean position will be
JEE Mains 2019 Hard