In tin at room temperature, the mobility of mobile electrons is about 1.5 ✕ 10⁻³ (m/s)/(v/m), and there are about 3.7 ✕ 10²⁸ mobile electrons per m³. calculate the conductivity σ. in actual practice, it is usually easier to measure the conductivity σ and deduce the mobility u from this measurement.

Explanation:

As we know that mobility of electrons is given as

now we also know that

here we know

so we have

like poles repel so keep pushing north to north and repels funny to see this

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.