Answer:
Noise cancelling headphones have a microphone which listens to the ambient noise. The headphone then processes the sound and provides a wave to produce destructive interference. This cancels the ambient noise.
Explanation:
First, let us understand what interference is. Interference is the phenomenon that occurs when two waves superpose to form a wave which has a different wavelength, frequency, amplitude than the original two waves. When the crest of one wave superposes with the other waves crest then this results in the amplitude increasing. This is known as constructive interference. When the crest of one wave superposes with the other waves trough then this results in the amplitude decreasing. This known as destructive interference.
Noise cancelling headphones have a microphone which listens to the ambient noise. The headphone then processes the sound and provides a wave to produce destructive interference. This cancels the ambient noise.
Answer:
C more than 1 second
Explanation:
it will take time since its 4.9 meters and how hard you throw it down
A example of an alternative renewable energy source is wind energy. I hope that helps.
Answer:
The magnetic field strength, the energy density, and the power flow per unit area are , and 13.18 W/m².
Explanation:
Given that,
Electromagnetic wave strength E= 70.5 V/m
(I). We need to calculate the magnetic field strength
Using formula of Electromagnetic wave strength
(II). We need to calculate the energy density
Using formula of energy density
(III). We need to calculate the power flow per unit area
Using formula of poynting vector
Put the value into the formula
Hence, The magnetic field strength, the energy density, and the power flow per unit area are , and 13.18 W/m².