Answer:

Explanation:
From the question we are told that:
Fermi energy of conduction electrons 
Generally the equation for Fermi energy is mathematically given by



Where
h= Planck's constant




Answer:
Refraction is the slowing down of light waves as they pass into a different medium and speeding as they pass out.
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Generally, the internal resistance of the new battery is small, about 0.2 euros, while the old battery is large, close to 1 euro ,
Answer:
26.67 m/s
Explanation:
From the law of conservation of linear momentum, the initial sum of momentum equals the final sum.
p=mv where p is momentum, m is the mass of object and v is the speed of the object
Initial momentum
The initial momentum will be that of basketball and volleyball, Since basketball is initially at rest, its initial velocity is zero

Final momentum
