Answer:
B.) by interfering with sound waves
Explanation:
As we know that the interference of sound waves is of two types
1). constructive interference
2). destructive interference
now we know that constructive interference means the resultant intensity will be more than the intensity of interfering waves as here two waves are in same phase.
In destructive interference the resultant of two waves is given by the minimum resultant of the intensity as here the phase of two waves are opposite to each other.
So we will say that
here in case of noise cancelling headphones we know that the phase of noise is always made in opposite phase with the sound which is used to cancelled the noise.
This will reduce the noise and we will get a clear sound
I think the correct answer from the choices listed above is option B. The very high voltage needed to create a spark across the spark plug is produced at the transformer's secondary winding. <span>The secondary coil is engulfed by a powerful and changing magnetic field. This field induces a current in the coils -- a very high-voltage current.</span>
C should be the right answer! hopefully this helps!
The current initially through the fingers is : 1.5 * 10⁻⁵ amp
The current when the resistance between them drops is : 3 * 10⁻⁵ amp
<u>Given data : </u>
Voltage ( V ) = 6 V
Initial resistance ( r ) = 400,000 ohms
Final resistance ( R ) = 200,000 ohms
<h3>Determine The Current </h3>
A) initially through fingers
I = V / r
= 6 V / 400,000
= 1.5 * 10⁻⁵ amp
B) when the resistance between them drops
I = V / R
= 6 V / 200000
= 3 * 10⁻⁵ amp
Hence we can conclude that The current initially through the fingers is : 1.5 * 10⁻⁵ amp and The current when the resistance between them drops is : 3 * 10⁻⁵ amp
Learn more about current calculation : brainly.com/question/25922783
