JEE PHYSICS UNIT 15
QUIZ NO 3
TOTAL QUESTIONS = 20


1. In an electromagnetic wave in free space, the root mean square value of the electric field is Erms = 6 V/m. The peak value of the magnetic field is:


2. Out of the following options, which one can be used to produce a propagating electromagnetic wave?


3. A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c = velocity of light):


4. The energy of the electromagnetic waves is of the order of 15 keV. To which part of the spectrum does it belong?


5. Light with an energy flux of 25 x 10^4 W/m^2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm^2, the average force exerted on the surface is:


6. An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity εr = 4.0. Then, the wavelength and speed of the wave in the medium are:


7. The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is:


8. Which of the following statements is false for the properties of electromagnetic waves?


9. The electric field associated with an electromagnetic wave in vacuum is given by E = 40 cos(kz - 6 x 10^8 t) i V/m, where E, z, and t are in SI units. The value of k is:


10. The electric and magnetic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by:


11. The energy carried by an electromagnetic wave is proportional to:


12. Infrared waves are produced by:


13. The electromagnetic spectrum includes:


14. The property of electromagnetic waves that makes them suitable for radar systems is:


15. Which type of electromagnetic waves is emitted by a black body at room temperature?


16. Ultraviolet radiation is harmful because:


17. A beam of light passing through a prism disperses into various colors because of:


18. Which of the following electromagnetic waves has the highest energy?


19. The magnetic field in an electromagnetic wave is represented as B = B0 sin(kx - ωt). The electric field E is given by:


20. Electromagnetic waves transport:



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