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Svetradugi [14.3K]

3 years ago

13

What is the Doppler effect ?

2 answers:

Nadya [2.5K]3 years ago

8 0

The Doppler Effect is when the frequency changes and of a wave. It is commonly heard when a vehicle siren or horn approaches, passes and recedes from the person or observer.

blagie [28]3 years ago

5 0

The doppler effect is a phenomenon that happens with sound or sound waves. It's the change in frequency of a wave.

Let's say you have something that's making noise and as that thing is coming towards you, not only does it get louder but the pitch changes and it gets sharp as it comes towards you and goes flat as it goes away. So the waves are getting compressed as they come towards you and they spread out as they're going away. Something similar happens with light and we call that the redshift.

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If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed

beks73 [17]

Answer:

v = 5.9 x 10⁷ m/s

Explanation:

The kinetic energy of the electron in terms of potential difference is given as:

$K.E = eV$ --------------- equation (1)

where,

e = charge on electron = 1.6 x 10⁻¹⁹ C

V = Potential Difference = 9.9 KV = 9900 Volts

The kinetic energy in general is given as:

$K.E = \frac{1}{2}mv^{2}\\$ --------- equation (2)

where,

m = mass of electron = 9.1 x 10⁻³¹ kg

v = speed of electron = ?

Therefore, comparing equation (1) and equation (2), we get:

$\\\frac{1}{2}mv^{2} = eV\\\\\frac{1}{2}(9.1\ x\ 10^{-31}\ kg)v^{2} = (1.6\ x\ 10^{-19}\ C)(9900\ volts)\\\\v = \sqrt{34.81\ x\ 10^{14}} \\$

<u>v = 5.9 x 10⁷ m/s</u>

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3 years ago