Last Updated On 16-03-2023 - By Jeesha Sara
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by [Given permittivity of space ∈0 = 9 × 10−12 SI units, Speed of light c = 3 × 108 m/s]
|
a. |
1 kV/m |
b. |
2 kV/m |
|
c. |
1.4 kV/m |
d. |
0.7 kV/m |
Question ID - 50361 :- A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by [Given permittivity of space ∈0 = 9 × 10−12 SI units, Speed of light c = 3 × 108 m/s]
a.
1 kV/m
b.
2 kV/m
c.
1.4 kV/m
d.
0.7 kV/m
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by [Given permittivity of space ∈0 = 9 × 10−12 SI units, Speed of light c = 3 × 108 m/s]
|
a. |
1 kV/m |
b. |
2 kV/m |
|
c. |
1.4 kV/m |
d. |
0.7 kV/m |
Intensity of EM wave is given by
I = 
= 
C
= 
= 
× 9 × 10−12 × E2 × 3 ×108
E = 
× 103 kV/m
= 1.4 kV/m
Next Question :
|
Which one of the following can extinguish fire more quickly? |
|||
|
(a) |
Cold water |
(b) |
Boiling water |
|
(c) |
Hot water |
(d) |
Ice |
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