Welcome to your Electro Magnetic Waves
1.
If ε and μ are the electric permittivity and magnetic permeability in vacuum and ε0 and μ0 are corresponding quantities in medium, then refractive index n of medium is:
2.
Peak value of magnetic field if Erms = 6 V/m
3.
The velocity of electromagnetic radiation in a medium of permittivity ε and permeability μ is given by:
4.
The oscillating electric and magnetic field vectors of EM wave are oriented:
5.
Speed of EM wave in vacuum is
6.
Decreasing order of wavelength:
7.
Which is not an EM wave?
8.
Which colour of light has the longest wavelength?
9.
Which electromagnetic wave is used in remote controls?
10.
Radiation of energy E falls normally, momentum transferred
11.
Greenhouse effect due to
12.
The ratio of amplitude of magnetic field to the amplitude of electric field for an EM wave in vacuum is equal to:
13.
Microwave oven heats efficiently because
14.
Frequency order: X-rays > γ-rays > UV, then λ?
15.
If λ₁ > λ₂ > λ₃ (visible, X-rays, microwaves):
16.
Radiation by human body is
17.
EM waves do not require ______ for propagation.
18.
Energy of EM wave is 15 keV. It belongs to which part?
19.
Which one statement is FALSE about EM waves?
20.
Which is positively charged?
21.
EM wave propagating with velocity i, E along +y, direction of B
22.
The electric and magnetic field associated with an EM wave propagating along +z axis can be represented by:
23.
Energy flux 25×10⁴ W/m² falls on surface 15 cm², average force
24.
If E and B represent electric and magnetic field vectors of the electromagnetic waves, then the direction of propagation of waves will be along:
25.
Which property is common to all EM waves?
26.
Which electromagnetic radiation has the highest energy?
27.
The electric field of an EM wave is Ey = 2.5 cos[(2π×10^6) t - (π×10^2) x] (SI units). From this the wave is:
28.
Frequency 3.0 MHz passes to medium with μr=1, εr=4
29.
Solids studied using:
30.
Which EM wave is used in radar systems?
31.
Which EM wave is used in night vision devices?
33.
Electromagnetic radiations are caused by:
34.
Ratio of contributions of E and B field components in intensity of EM wave
35.
Which EM wave is used in satellite communication?
36.
The electric field associated with an e.m. wave in vacuum is E = E0 î 40 cos(kz - 6×10^8 t). If E0 is in volt/m, the value of wave vector k is:
37.
In increasing frequency, arrange: radio, gamma, X-rays
38.
The electric and magnetic field of an EM wave are:
39.
Which has the longest wavelength?
40.
The frequency of EM wave to observe particle radius 3 × 10⁻⁶ cm is of order of
41.
Lowest wavelength EM radiation is
43.
Smallest wavelength radiation:
44.
Which cannot produce EM wave
45.
Which wave is used in sterilization of surgical instruments?
