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Fed [463]
4 years ago
8

What is the young modulus of polythene?

Physics
1 answer:
Rina8888 [55]4 years ago
8 0
The Young’s modulus of polythene is 0.8
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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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