Welcome to your Electro Magnetic Waves
1.
EM wave propagating with velocity i, E along +y, direction of B
2.
Microwave oven heats efficiently because
3.
EM waves do not require ______ for propagation.
4.
Electromagnetic radiations are caused by:
5.
Peak value of magnetic field if Erms = 6 V/m
7.
Lowest wavelength EM radiation is
8.
The ratio of amplitude of magnetic field to the amplitude of electric field for an EM wave in vacuum is equal to:
9.
Decreasing order of wavelength:
10.
Which colour of light has the longest wavelength?
11.
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:
12.
Which EM wave is used in radar systems?
13.
Which is positively charged?
14.
Greenhouse effect due to
16.
If E and B represent electric and magnetic field vectors of the electromagnetic waves, then the direction of propagation of waves will be along:
17.
Solids studied using:
18.
Which one statement is FALSE about EM waves?
19.
Ratio of contributions of E and B field components in intensity of EM wave
20.
If λ₁ > λ₂ > λ₃ (visible, X-rays, microwaves):
21.
Which electromagnetic radiation has the highest energy?
22.
Which wave is used in sterilization of surgical instruments?
23.
The electric and magnetic field associated with an EM wave propagating along +z axis can be represented by:
24.
Smallest wavelength radiation:
25.
Frequency order: X-rays > γ-rays > UV, then λ?
26.
Frequency 3.0 MHz passes to medium with μr=1, εr=4
27.
In increasing frequency, arrange: radio, gamma, X-rays
28.
The electric and magnetic field of an EM wave are:
29.
Which cannot produce EM wave
30.
Which has the longest wavelength?
31.
Which electromagnetic wave is used in remote controls?
32.
The velocity of electromagnetic radiation in a medium of permittivity ε and permeability μ is given by:
33.
Which EM wave is used in night vision devices?
34.
Radiation of energy E falls normally, momentum transferred
35.
Which EM wave is used in satellite communication?
36.
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:
37.
Which property is common to all EM waves?
38.
The frequency of EM wave to observe particle radius 3 × 10⁻⁶ cm is of order of
39.
The oscillating electric and magnetic field vectors of EM wave are oriented:
40.
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:
41.
Which is not an EM wave?
42.
Energy of EM wave is 15 keV. It belongs to which part?
43.
Speed of EM wave in vacuum is
44.
Energy flux 25×10⁴ W/m² falls on surface 15 cm², average force
45.
Radiation by human body is
