The resistivity of a certain semi-metal is 10-3 Ohm-cm. Suppose we would like to prepare a silicon wafer with the same resistivi
ty. Assuming we will use n-type dopants only, what dopant density would we choose
1 answer:
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Answer:
The smallest separation distance between the speakers is 0.71 m.
Explanation:
Given that,
Two speakers, one directly behind the other, are each generating a 240-Hz sound wave, f = 240 Hz
Let the speed of sound is 343 m/s in air. The speed of sound is given by the formula as :
To produce destructive interference at a listener standing in front of them,
So, the smallest separation distance between the speakers is 0.71 m. Hence, this is the required solution.
Answer:
Velocity of the car at the bottom of the slope: approximately .
It would take approximately for the car to travel from the top of the slope to the bottom.
Explanation:
The time of the travel needs to be found. Hence, make use of the SUVAT equation that does not include time.
- Let
denote the final velocity of the car.
- Let
denote the initial velocity of the car.
- Let
denote the acceleration of the car.
- Let
denote the distance that this car travelled.
.
Given:
.
.
.
Rearrange the equation and solve for
:
.
Calculate the time required for reaching this speed from at
:
.