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