Answer:
the free electron density of lithium is 2.3 × 10²⁸ /m³
Explanation:
The Fermi energy is 4.72 eV.
The Fermi energy (highest filled orbital energy ) of free electron is
Rearrange the above equation for free electron density of lithium
where,
h = 6.626 × 10⁻³⁴J.s
= 9.11 × 10⁻³¹kg
= 4.72eV
Thus, the free electron density of lithium is 2.3 × 10²⁸ /m³
Answer:
4) C.mass
5) C. Potential Energy
Explanation:
4) Kinetic energy (KE) of an object is the energy that it possesses due to its motion. If a mass is in motion ,it has a kinetic energy .
By definition
what matters in Kinetic energy is the mass and the velocity only .
there fore the answer is
C.mass
5) Potential energy is the energy stored in an object, due to the object's position or arrangement.
By definition
in potential energy the height matters.higher the height , higher the energy
therefore the answer is
C.Potential Energy