The siren of a police car at rest emits at a predominant frequency of 1980 hz. what frequency will you hear if you are at rest and the police car moves at 34.3.0m/s (a) toward you, and (b) away from you? explain

(a) 1782 Hz (b) 2178 Hz

Explanation:

The predominant frequency =1980 Hz

The speed of the police car =34.3 m/sec

The speed of sound in air =343 m/sec

(a) When the car moves towards you

According to Doppler's effect

(b) When the car moves away from you

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:

it about 600 mph from what i calculated