When i stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. how far to my left should i move to obtain destructive interference?

B. Half a wavelength

Explanation:

When i stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. how far to my left should i move to obtain destructive interference?

a. One-fourth of a wavelength

b. Half a wavelength

c. One wavelength

d. One and half a wavelengths

e. Two wavelengths

Destructive interference occurs when the right speaker is half a wavelength further away than the left. Let "d" represents distance from each speaker to the me, the listener. To achieve destructive interference, I would have to calculate the distance in terms of wavelength as thus:

(d + wavelength/4) - (d - wavelength/4) = half a wavelength/4

Put in a different term, the path difference must be half a wavelength. Whatever that amount is, you can achieve this path difference by moving half that amount.

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:

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