1
NEET 2022 Phase 1
+4
-1

When light propagates through a material medium of relative permittivity $$\varepsilon$$r and relative permeability $$\mu$$r, the velocity of light, v is given by (c-velocity of light in vacuum)

A
v = c
B
$$v = \sqrt {{{{\mu _r}} \over {{\varepsilon _r}}}}$$
C
$$v = \sqrt {{{{\varepsilon _r}} \over {{\mu _r}}}}$$
D
$$v = {c \over {\sqrt {{\varepsilon _r}{\mu _r}} }}$$
2
NEET 2021
+4
-1
For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?
A
$$- \widehat j + \widehat k, - \widehat j + \widehat k$$
B
$$\widehat j + \widehat k, \widehat j + \widehat k$$
C
$$- \widehat j + \widehat k, - \widehat j - \widehat k$$
D
$$\widehat j + \widehat k, - \widehat j - \widehat k$$
3
NEET 2020 Phase 1
+4
-1
The ratio of contributions made by the electric field and magnetic field components to the intensity of and electromagnetic wave is : (c = speed of electromagnetic waves)
A
1 : 1
B
1 : c
C
1 : c2
D
c : 1
4
NEET 2019
+4
-1
Which colour of the light has the longest wavelength?
A
blue
B
violet
C
red
D
green
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