Which of the following is true statement about isotopes?

a.
the number of protons always equals the number of neutrons in all isotopes.

b.
the number of protons never equals the number of neutrons in an isotope.

c.
different isotopes for the same element will always have the same numbers of neutrons.

d.
different isotopes for the same element always have the same number of protons.

you would expect a sound wave to speed up. - b)

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: