Electromagnetic Waves · Physics · COMEDK
MCQ (Single Correct Answer)
Column - I lists the waves of the electromagnetic spectrum. Column - II gives approximate frequency range of these waves. Match Column - I and Column - II and choose the correct match from the given choices.
| Column I | Column II | ||
|---|---|---|---|
| (A) | Radiowaves | (P) | $$ 10^{18} \text { to } 10^{20} \mathrm{~Hz} $$ |
| (B) | Microwaves | (P) | $$ 10^{11} \text { to } 5 \times 10^{14} \mathrm{~Hz} $$ |
| (C) | Infrared | (R) | $$ 10^4 \text { to } 10^8 \mathrm{~Hz} $$ |
| (D) | X-rays | (S) | $$ 10^9 \text { to } 10^{12} \mathrm{~Hz} $$ |
The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is
A plane electromagnetic wave of frequency $$20 \mathrm{~MHz}$$ travels through a space along $$x$$-direction. If the electric field vector at a certain point in space is $$6 \mathrm{~Vm}^{-1}$$, then what is the magnetic field vector at that point?
What feature of the infrared waves make it useful for the haze photography?
Speed of electromagnetic wave in a medium having relative permittivity $$\varepsilon_r$$ and relative permeability $$\mu_r$$ is (speed of light in air, $$c=3\times10^8$$ m/s)
A 30 mW laser beam has a cross-sectional area of 15 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by
[Permuittivity of space, $$\varepsilon_0=9\times10^{-12}$$
Speed of light, $$c=3\times10^8$$ m/s]
The correct arrangement in increasing order of wavelength of X-rays, UV rays, microwave is
Which of the following waves are used to treatment of muscles ache?
Which of the following has/have zero average value in a plane electromagnetic wave?