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VITEEE 2011 Solved Paper
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© examsnet.com
Question : 33
Total: 120
An electromagnetic wave going through vacuum is described by
E =
E
0
sin (kx - ωt)
Which of the following is/are independent of the wavelength?
k
ω
2
k/ω
k
ω
2
Validate
Solution:
The given quantities can be expressed as:
k
is given by
k
=
2
π
λ
ω
is given by
ω
=
2
π
v
c
=
v
λ
⇒
ω
=
2
π
c
λ
k
∕
w
is given by
k
ω
=
2
π
∕
λ
2
π
c
∕
λ
=
1
c
k
ω
is given by
k
×
ω
=
2
π
λ
×
2
Π
c
λ
=
4
Π
2
c
λ
2
Thus,
k
∕
w
is independent of the wavelength.
© examsnet.com
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