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Charra [1.4K]
2 years ago
6

How many electrons should be removed from an initially uncharged spherical conductor of radius 0.300 m to produce a potential of

7.50kV at the surface?
Physics
1 answer:
Simora [160]2 years ago
3 0

1.56 x 10^12 electrons  electrons should be removed.

What are electrons   ?

The subatomic particles that revolve around an atom's nucleus are called electrons. They are smaller than protons or neutrons and have a negative charge. They are actually 1,800 times smaller. They also convey electric current.


Radius = 0. 300 m

Potential = 7.50 kV = 7.5 x 10^ 3 V

We kniw,

(Electric Potential) V = ke q/r

and q= ne

Therefore, n= Vr/ ke e

now substituting the values we get,

n= 1.56 x 10^12 electrons

To learn more about electrons click on the link below:

brainly.com/question/13822373

#SPJ4

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What is the wavelength of an FM radio wave of frequency 90Mhz?
jok3333 [9.3K]

Answer:

3.3m

Explanation:

Given parameters:

Frequency  = 90Mhz

Unknown:

Wavelength  = ?

Solution:

To find the wavelength, use the expression below;

  V  = f x wavelength

V is the speed of light = 3 x 10⁸m/s

f is the frequency

Now;

 Insert the parameters

     3 x 10⁸  = 90 x 10⁶ x wavelength

   Wavelength = \frac{3 x 10^{8} }{9 x 10^{7} }   = 3.3m

7 0
3 years ago
Calculate the threshold energy in kj/mol of electrons in aluminum, given that the lowest frequency photon for which the photoele
Viktor [21]

Answer: The threshold energy of the electrons in aluminium is 393.71 kJ/mol.

Explanation: Threshold energy is the minimum amount of energy which is required to emit a photon from a metal surface.

Mathematically,

E=N_Ah\nu_o

Where,

E = Threshold energy

N_A = Avogadro's constant = 6.022\times 10^{23}atoms/mol

h = Planck's Constant = 6.624\times 10^{-34}Js

\nu = Frequency of the particle =9.87\times 10^{14}s^{-1}

Putting values in above equation, we get:

E=(6.022\times 10^{23})atoms/mol\times (6.624\times 10^{-34})Js\times (9.87\times 10^{14})s^{-1}

E=393.71\times 10^3J/mol=393.71kJ/mol   (Conversion Factor: 1kJ = 1000J)

6 0
3 years ago
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shutvik [7]

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Explanation:

I did it

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Phoenix [80]

Answer:

As mass increase acceleration decrease so the relationship is opposite

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3 years ago
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Afina-wow [57]
Water does not have a pH of 0, its actually 7. Also, it is not less dense than ice. Lastly, it does not dissolve in most substances, its the complete opposite. As its a solvent, not a solute. 

Answer: B
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4 years ago
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