A small object carrying a charge of -3.00 nc is acted upon by a downward force of 30.0 nn when placed at a certain point in an e
1 answer:
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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:
where,
h = Planck's constant =
= mass of electron =
N = Number of atoms present in per volume of atom multiplied by number of electrons present in given atom =
= Avogadro's number =
(When the mass is in kilograms)
V = Volume =
M = molecular weight of lead = 207.2 g/mol
Putting values in above equation, we get:
(Conversion factor: 1 km = 1000 m)
Hence, the Fermi velocity of lead is 64.4 km/s
Answer:
Output power of the charger is 9.85 watts.
Explanation:
It is given that,
Output current of the USB charger, I = 1.97 A
The standard USB output voltage, V = 5 V
We need to find the output power of the charger. It can be determined using the following formula as :
P = V × I
P = 9.85 watts
The output power of the charger is 9.85 watts. Hence, this is the required solution.