If a 20 W Laser Beam,which Has an Initial Diameter $\times$

question 22

Multiple Choice

If a 20 W laser beam,which has an initial diameter of 2.0 mm,spreads out to a diameter of 2.0 m after traveling 10,000 m,what is the initial E_rms of the beam?

• A) 4.9 \(\times\) 10⁴ V/m
• B) 2.5 \(\times\) 10³ V/m
• C) 1.2 \(\times\) 10³ V/m
• D) 1.9 \(\times\) 10² V/m
• E) 1.7 \(\times\) 10² V/m

---

Definitions:

Complimented

Having been praised or positively remarked upon, typically regarding one's actions or attributes.

Stranger

An individual who is not known personally or is unfamiliar to someone else.

Symmetrical

Having identical form or arrangement on both sides of a dividing line or plane.

Physically Attractive

Pertaining to characteristics of a person's appearance that are appealing or desirable to others.