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djyliett [7]
2 years ago
15

When do sunspots disappear?

Physics
1 answer:
dedylja [7]2 years ago
8 0

Answer:

In 5 years or so, the sun will be awash in sunspots and more prone to violent bursts of magnetic activity.

Explanation

once the magnetic field weakens the area and cold plasma enters the area of the sunspot

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Lead atoms occupy a volume of 3 x 10-29 m3. Each atom contributes two free electrons. Calculate the Fermi velocity of lead.
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<u>Answer:</u> The Fermi velocity of lead is 64.4 km/s.

<u>Explanation:</u>

To calculate the Fermi velocity, we use the equation:

V_f=\frac{h}{2\pi m_e}(\frac{3\pi^2N}{V})^{1/3}

where,

h = Planck's constant = 6.62\times 10^{-34}Js

m_e = mass of electron = 9.1\times 10^{-31}kg

N = Number of atoms present in per volume of atom multiplied by number of electrons present in given atom = \frac{2\times N_A\times V}{M}

N_A = Avogadro's number = 6.022\times 10^{26}mol^{-1}    (When the mass is in kilograms)

V = Volume = 3\times 10^{-29}m^3

M = molecular weight of lead = 207.2 g/mol

Putting values in above equation, we get:

V_f=\frac{6.62\times 10^{-34}}{2\times 3.14\times (9.1\times 10^{-31})}(\frac{3\times (3.14)^2\times (2\times 6.022\times 10^{23}\times 3\times 10^{-29})}{3\times 10^{-29}\times 207.2})^{1/3}

V_f=0.0644\times 10^6m/s=64.4km/s     (Conversion factor: 1 km = 1000 m)

Hence, the Fermi velocity of lead is 64.4 km/s

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