Please help! 20 points! Name an example when you personally have experienced the Doppler effect.

1 answer:

3 0

When I ride the train, the song of the train whistle is an example of the Doppler Effect. Because a train is at the center of sound waves it produces, which radiate in concentric circles around it, there is no difference between the sound heard by someone on the platform, and the sound of the train as heard by someone standing behind the caboose.

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The current in the electron beam of a typical video display terminal is 200 µa. How many electrons strike the screen each minute

noname [10]

The number of electrons strike the screen each minute when thee current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

<h3>How to calculate electric charge?</h3>

Electric charge is equal to the product of electricity current flowing and the total time. It can be given as,

$q=It$

Here, I is current and t is time.

The current in the electron beam of a typical video display terminal is 200 µa for one minute. Thus, the total charge is,

$q=200\times10^{-6}\text{ A}\times(60\text{ s})\\q=0.012\rm \;C$

The number of electron flow is the ratio of total charge to the charge of one electron. The charge on one electron is 1.6×10⁻¹⁹ C. Thus, the number of electron is,

$n=\dfrac{0.012}{1.6\times10^{-19}}\\n=7.5\times10^{16}$

Thus, the number of electrons strike the screen each minute when the current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

Learn more about the electric charge here;

brainly.com/question/2373424

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What does it mean by the fact that the acceleration of a car is 5m/s square??

dalvyx [7]

Answer:

An acceleration of 5m/s^2 means that the velocity of a body is increasing by 5m/s per second in a certain direction

Explanation:

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