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