Question

a wooden log was 30 kg if the entire log is made up of electrons then find the number of electrons in the wooden log​

Answer 1

Answer:

The invariant mass of an electron is approximately 9.109×10−31 kilograms, or 5.489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV.

Answer 2

No. of electrons in the wooden block $n=3.2933073684296591\times 10^{31}\ electrons$

Explanation:

We have mass of an electron, $m_e=9.10938356 \times 10^{-31}\ kg$

Now, given that a wooden block made entirely of electrons weighs, $m=30\ kg$

∴No. of electrons

$n=\frac{m}{m_e}$

$n=\frac{30}{9.10938356 \times 10{-31}}$

$n=3.2933073684296591\times 10^{31}\ electrons$

TOPIC:unitary method, mass of electron

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