A laser beam has a cross-sectional area of

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

27 \text{ mW}

laser beam has a cross-sectional area of

10 \text{ mm}^2

. Find the magnitude of the maximum electric field in this electromagnetic wave. [Given permittivity of space

\epsilon_0 = 9 \times 10^{-12} \text{ SI units}

, Speed of light

c = 3 \times 10^8 \text{ m/s}

] (1)

2 \text{ kV/m}

(2)

1 \text{ kV/m}

(3)

0.7 \text{ kV/m}

(4)

1.4 \text{ kV/m}