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KEAM 2013 Physics and Chemistry Paper
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© examsnet.com
Question : 55
Total: 120
If the magnetic field of an electromagnetic wave is given as
B
y
=
2
×
10
−
7
s
i
n
(
10
3
x
+
105
×
10
12
t
)
tesla, the wavelength of the electromagnetic wave is
0.314 mm
0.628 mm
6.28 mm
1.26 mm
0.0628 mm
Validate
Solution:
Given,
B
y
=
2
×
10
−
7
sin
(
10
3
x
+
1.5
×
10
12
t
)
We know that the general equation of a EM wave as
B
=
B
0
sin
(
ω
t
+
k
x
)
On comparing,
K
=
2
π
λ
λ
=
2
π
K
Here,
K
=
10
3
m
−
1
λ
=
2
π
10
3
=
6.28
×
10
−
3
m
λ
=
6.28
m
m
© examsnet.com
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