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