Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486.1 nm.

Explanation:

The relationship between frequency and wavelength for any electromagnetic wave is:

where

is the speed of light

f is the frequency

is the wavelength

In this problem, we have green light with wavelength

Therefore, re-arranging the previous equation and plugging the numbers in, we can find the frequency of the emitted light:

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:

1 a

2 b

3 b

4 d

5 d

6 d

explanation: