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