Electromagnetic Waves · JEE Main previous year questions

2024 3 questions

1. Q342024 · 5 Apr 2024 · Shift 2

   Match List I with List II : $$\begin{array}{llll}& \text{LIST I}& & \text{LIST II}\\ & \text{EM-Wave}& & \text{Wavelength Range}\\ \text{A.}& \text{Infra-red}& \text{I.}& <10^{-3}\mathrm{nm}\\ \text{B.}& \text{Ultraviolet}& \text{II.}& 400\mathrm{nm}\text{ to }1\mathrm{nm}\\ \text{C.}& \text{X-rays}& \text{III.}& 1\mathrm{mm}\text{ to }700\mathrm{nm}\\ \text{D.}& \text{Gamma rays}& \text{IV.}& 1\mathrm{nm}\text{ to }10^{-3}\mathrm{nm}\end{array}$$ Choose the correct answer from the options given below :

   1. A.(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
   2. B.(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
   3. C.(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
   4. D.(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
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   Answer: B

2. Q492024 · 4 Apr 2024 · Shift 2

   Arrange the following in the ascending order of wavelength: A. Gamma rays $({\lambda }_1)$ B. $x$ - rays $({\lambda }_2)$ C. Infrared waves $({\lambda }_3)$ D. Microwaves $({\lambda }_4)$ Choose the most appropriate answer from the options given below

   1. A.${\lambda }_1<{\lambda }_2<{\lambda }_3<{\lambda }_4$
   2. B.${\lambda }_2<{\lambda }_1<{\lambda }_4<{\lambda }_3$
   3. C.${\lambda }_4<{\lambda }_3<{\lambda }_2<{\lambda }_1$
   4. D.${\lambda }_4<{\lambda }_3<{\lambda }_1<{\lambda }_2$
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   Answer: A

3. Q462024 · 27 Jan 2024 · Shift 1

   A plane electromagnetic wave propagating in $x$-direction is described by $E_y=(200{\text{Vm}}^{-1})\sin \left[1.5\times 10^{7}t-0.05x\right]$; The intensity of the wave is : (Use ${ϵ}_0=8.85\times 10^{-12}{\text{C}}^2{\text{ N}}^{-1}{\text{ m}}^{-2}$)

   1. A.$35.4{\text{ Wm}}^{-2}$
   2. B.$53.1{\text{ Wm}}^{-2}$
   3. C.$26.6{\text{ Wm}}^{-2}$
   4. D.$106.2{\text{ Wm}}^{-2}$
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   Answer: B