Noise-canceling headphones are an application of destructive interference. each side of the headphones uses a microphone to pick up noise, delays it slightly, then rebroadcasts the noise next to your ear where it can interfere with the incoming sound wave of the noise. suppose you are sitting 1.8 m from an annoying, 200 hz buzzing sound.

what is the minimum headphone delay, in ms, that will cancel this noise? (the answer isn't t = 1/f is something i'm missing here as the answer isn't 5ms)

Consider the following calculations

Explanation:

from the given data

wavelength of the sound, lamda = v/f

= 343/200

= 1.715 m

for distructive interfrence, path diffrnce = lamda/2

= 1.715/2

= 0.8575 m

so, delay time = 0.8575/343

= 0.0025 s

= 2.5 ms

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

good for her? ? where is the question?