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Class XII Physics Electromagnetic Waves 1
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Question 1
A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is
Question 2
The rms value of the electric field of the light coming from the Sun is 720 N/C, the average total energy density of the electromagnetic wave is
Question 3
An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ε = 4.0. Then
Question 4
To decrease the cut-off wavelength of continuous X-rays by 25%, the potential difference across the X-ray tube
Question 5
An electromagnetic wave in vacuum has the electric and magnetic fields and , which are always perpendicular to each other. The direction of polarization is given by and that of wave propagation by . Then
Question 6
The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is :
Question 7
Match List-I (Electromagnetic wave type) with List-II (Its association / application) and select the correct option from the choices given below the lists :
Question 8
During the propagation of electromagnetic waves in a medium:
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May 6JEE & BITSAT