JEE Mains · Physics · STD 12 - 8. Electromagnetic waves
Match the List \(-I\) (Phenomenon associated with electromagnetic radiation) with List \(-II\) (Part of electromagnetic spectrum) and select the correct code from the choices given below this lists
| List \(I\) | List \(II\) |
| \(I\) Doublet of sodium | \((A)\) Visible radiation |
| \(II\) Wavelength corresponding to temperature associated with the isotropic radiation filling all space | \((B)\) Microwave |
| \(III\) Wavelength emitted by atomic hydrogen in interstellar space | \((C)\) Short radio wave |
| \(IV\) Wavelength of radiation arising from two close energy levels in hydrogen | \((D)\) \(X-\) rays |
- A \((I)-(A), (II)-(B), (III)-(B), (IV)-(C)\)
- B \((I)-(A), (II)-(B), (III)-(C ), (IV)-(C)\)
- C \((I)-(B), (II)-(A), (III)-(D), (IV)-(A)\)
- D \((I)-(D), (II)-(C), (III)-(A), (IV)-(B)\)
Answer & Solution
Correct Answer
(B) \((I)-(A), (II)-(B), (III)-(C ), (IV)-(C)\)
Step-by-step Solution
Detailed explanation
The sodium spectrum is dominated by the bright doublet, which are known as the sodium \(D\) lines. The wavelength of these lines are around the range \(588.9\; n m\) and \(589.5 \;n m\). Now the wavelength of these sodium \(D\) lines falls under the wavelength range of the X…
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 small circular loop of wire of radius \(a\) is located at the centre of a much larger circular wire loop of radius \(b\). The two loops are in the same plane. The outer loop of radius \(b\) carries an alternating current \(I = I_0\, cos\, (\omega t)\) . The emf induced in the smaller inner loop is nearlyJEE Mains 2017 Hard
- Moment of inertia of a cylinder of mass \(M,\) length \(L\) and radius \(R\) about an axis passing through its centre and perpendicular to the axis of the cylinder is \(I = M \left(\frac{ R ^{2}}{4}+\frac{ L ^{2}}{12}\right) .\) If such a cylinder is to be made for a given mass of material, the ratio \(\frac LR\) for it to have minimum possible \(I\) isJEE Mains 2020 Hard
- Three identical resistors with resistance \(R=12 \Omega\) and two identical inductors with sell inductance \(L=5 mH\) are connected to an ideal battery with emf of 12 V as shown in figure. The current through the battery long after the switch has been closed will be _________ A.
JEE Mains 2023 Medium - Activities of three radioactive substances \(A , B\) and \(C\) are represented by the curves \(A, B\) and \(C,\) in the figure. Then their half-lives \(T _{\frac{1}{2}}( A ): T _{\frac{1}{2}}( B ): T _{\frac{1}{2}}( C )\) are in the ratio
JEE Mains 2020 Hard - A vector has magnitude same as that of \(\overrightarrow{\mathrm{A}}-=3 \hat{\mathrm{j}}+4 \hat{\mathrm{j}}\) and is parallel to \(\overrightarrow{\mathrm{B}}=4 \hat{\mathrm{i}}+3 \hat{\mathrm{j}}\). The \(\mathrm{x}\) and \(y\) components of this vector in first quadrant are \(\mathrm{x}\) and \(3\) respectively where \(x\)= _______.JEE Mains 2024 Hard
- On the basis of kinetic theory of gases, the gas exerts pressure because its molecules:JEE Mains 2021 Medium
More PYQs from JEE Mains
- The function \(f:(-\infty, \infty) \rightarrow(-\infty, 1),\) defined by \(f(x)=\frac{2^x-2^{-x}}{2^x+2^{-x}} \text { is : }\)JEE Mains 2025 Easy
- Two short magnetic dipoles \({m}_{1}\) and \({m}_{2}\) each having magnetic moment of \(1\, {Am}^{2}\) are placed at point \({O}\) and \(P\) respectively. The distance between \(OP\) is \(1\, meter.\) The torque experienced by the magnetic dipole \({m}_{2}\) due to the presence of \({m}_{1}\) is ...... \(\times 10^{-7}\, {Nm}\)
JEE Mains 2021 Medium - Equation of the line of the shortest distance between the lines \(\frac{x}{1} = \frac{y}{{ - 1}} = \frac{z}{1}\) and \(\frac{{x - 1}}{0} = \frac{{y + 1}}{{ - 2}} = \frac{z}{1}\) isJEE Mains 2014 Hard
- An organ pipe \(40\,cm\) long is open at both ends. The speed of sound in air is \(360\,ms ^{-1}\). The frequency of the second harmonic is \(...........\,Hz\).JEE Mains 2023 Easy
- The magnitudes of power of a biconvex lens (refractive index 1.5) and that of a plano-concave lens (refractive index \(=1.7\)) are same. If the curvature of plano-concave lens exactly matches with the curvature of back surface of the biconvex lens, then ratio of radius of curvature of front and back surface of the biconvex lens is ___________ .JEE Mains 2026 Easy
- \(\frac{x}{x+4}\) is the ratio of energies of photons produced due to transition of an electron of hydrogen atom from its \((i)\) third permitted energy level to the second level and \((ii)\) the highest permitted energy level to the second permitted level. The value of \(x\) will be.JEE Mains 2022 Medium