What are three properties of electromagnetic waves

Answer/Explanation:

They can travel through empty space. (This means if there is no air, it can still travel).

They travel in straight lines. (Think about if you shine a flashlight, it goes straight, not curved. It reflects if it hits something, but then changes direction and continues to travel in straight lines).

They are made of photons. (This is the type of particle the waves are made of).

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

cancer risk hope this