A 44 × $10^{14}$ Hz Laser Emits a 2 $0.24 \mathrm {~J} / \mathrm { m } ^ { 3 }$

question 54

Multiple Choice

A 4.4 × $10^{14}$ Hz laser emits a 2.1 μs pulse that is 5.0 mm in diameter.The energy density in the beam is $0.24 \mathrm {~J} / \mathrm { m } ^ { 3 }$ How many wavelengths are there in the length of the beam? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A)9.2 × 10⁸
• B)2.8 × 10⁹
• C)2.8 × 10⁸
• D)9.2 × 10⁹
• E)2.8 × 10¹⁰

---

Definitions:

Morphemes

The smallest grammatical units in a language that carry meaning. Morphemes can be full words (free morphemes) or elements that can't stand alone (bound morphemes).

Syntax

The set of rules, principles, and processes that govern the structure of sentences in a given language, especially in terms of word order.

Telegraphic Speech

A form of communication observed in young children during language development, consisting of simple, two-word long sentences without grammatical markers.

Native Language

A native language is the first language a person learns, usually in childhood, and is often spoken in the home environment.