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Electromagnetic Waves

36 questions · Physics · NEET
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Electromagnetic Waves

36 questions · Physics · NEET

  1. The electric field in a plane electromagnetic wave is given by Ez​=60cos(5x+1.5×109t)V/m Then expression for the corresponding magnetic field is (here subscripts denote the direction of the…2025 · Q173 · MCQ
  2. The property which is not of an electromagnetic wave travelling in free space is that:2024 · Q187 · MCQ
  3. The electromagnetic radiation which has the smallest wavelength are2024 · Q182 · MCQ
  4. If the ratio of relative permeability and relative permittivity of a uniform medium is 1:4. The ratio of the magnitudes of electric field intensity (E) to the magnetic field intensity (H) of an EM wave propagating in that medium is…2024 · Q186 · MCQ
  5. In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of 2.0×1010 Hz and amplitude 48 Vm−1. Then the amplitude of oscillating…2023 · Q156 · MCQ
  6. The magnetic field of a plane electromagnetic wave is given by B=3×10−8cos(1.6×103x+48×1010t)j​, then the associated electric field will be :2022 · Q146 · MCQ
  7. The ratio of the magnitude of the magnetic field and electric field intensity of a plane electromagnetic wave in free space of permeability μ0​ and permittivity ε0​ is (Given that c - velocity) of light in free space2022 · Q158 · MCQ
  8. Match List - I with List - II Choose the correct answer from the options given below Includes table2022 · Q126 · MCQ
  9. When light propagates through a material medium of relative permittivity εr and relative permeability μr, the velocity of light, v is given by (c-velocity of light in vacuum)2022 · Q153 · MCQ
  10. For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?2021 · Q152 · MCQ
  11. The ratio of contributions made by the electric field and magnetic field components to the intensity of and electromagnetic wave is : (c = speed of electromagnetic waves)2020 · Q130 · MCQ
  12. Which colour of the light has the longest wavelength?2019 · Q146 · MCQ
  13. An EM wave is propagating in a medium with a velocity v=vi. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will…2018 · Q128 · MCQ
  14. In an electromagnetic wave in free space that root mean square value of the electric field is Erms = 6 V m−1. The peak value of the magnetic field is2017 · Q133 · MCQ
  15. Out of the following options which one can be used to produce a propagating electromagnetic wave ?2016 · Q128 · MCQ
  16. The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?2015 · Q120 · MCQ
  17. A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light)2015 · Q113 · MCQ
  18. Light with an energy flux of 25 × 104 W m−2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is2014 · Q118 · MCQ
  19. An electromagnetic wave of frequency υ=3.0 MHz passes from vaccum into a dielectric medium with relative permittivity εr​ = 4.0. Then2013 · Q132 · MCQ
  20. The condition under which a microwave oven heats up a food item containing water molecules most efficiently is2013 · Q131 · MCQ
  21. The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagatting in vacuum is equal to2012 · Q88 · MCQ
  22. The electric field associated with an em wave in vacuum is given by E = i 40 cos (kz − 6 × 108 t) where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is2012 · Q139 · MCQ
  23. The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by2011 · Q130 · MCQ
  24. The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is2011 · Q131 · MCQ
  25. The electric field of an electromagnetic wave in free space is given by E=10cos(107t+kx)j​V/m, where t and x are in seconds and metres respectively. It can be inferred that (1) the wavelength λ…2010 · Q82 · MCQ
  26. Which of the following statement is false for the properties of electromagnetic waves ?2010 · Q150 · MCQ
  27. The electric field part of an electromagnetic wave in a medium is represented by Ex = 0; Ey​=2.5CN​cos[(2π×106mrad​)t−(π×10−2srad​)x];…2009 · Q130 · MCQ
  28. The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by2008 · Q135 · MCQ
  29. The electric and magnetic field of an electromagnetic wave are2007 · Q119 · MCQ
  30. If λv, λx and λm represent the wavelengths of visible light, X-rays and microwaves respectively, then2005 · Q137 · MCQ
  31. Which of the following rays are not electromagnetic waves ?2003 · Q139 · MCQ
  32. We consider the radiation emitted by the human body. Which one of the following statements is true?2003 · Q140 · MCQ
  33. The velocity of electromagnetic wave is parallel to2002 · Q137 · MCQ
  34. What is the cause of Green house effect ?2002 · Q138 · MCQ
  35. Biological inportance of ozone layer is2001 · Q135 · MCQ
  36. The frequency order for γ-rays (a), X-rays (b), UV rays (c) is2000 · Q132 · MCQ