One end of a horizontal string is fixed to a wall. A transverse wave pulse in the form of a crest is generated at the other end and moves toward the wall, as shown. Consider the pulse after it has been reflected by the wall. v What is/are correct concerning the reflected pulse? A) The reflected pulse forms a crest. B) The reflected pulse forms a valley. C) The reflected pulse has a greater amplitude than that of the incident pulse. D) The reflected pulse has a greater speed than that of the incident pulse. 1. A and B only 2. A and D only 3. A, B and D only 4. A only 5. B and C only 6. B and D only 7. D only

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:

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.