Explanation :
It is given that,
Length of silicon bar, 
Free electron density, 
Hole density, 
The total current flowing in bar is the sum of drift current due to hole and the electrons.
where, n and p are electron and hole densities.
![J=Eq[n\mu_n+p\mu_p]](https://tex.z-dn.net/?f=J%3DEq%5Bn%5Cmu_n%2Bp%5Cmu_p%5D)
we know that 
So, ![J=\dfrac{V}{l}q[n\mu_n+p\mu_p]](https://tex.z-dn.net/?f=J%3D%5Cdfrac%7BV%7D%7Bl%7Dq%5Bn%5Cmu_n%2Bp%5Cmu_p%5D)
![J=\dfrac{1.6\times 10^{-19}\ C}{0.001\ V}[104\ cm^{-3}\times 1200\ cm^2/V\ s+1016\ cm^{-3}\times 500\ cm^2/V\ s]](https://tex.z-dn.net/?f=J%3D%5Cdfrac%7B1.6%5Ctimes%2010%5E%7B-19%7D%5C%20C%7D%7B0.001%5C%20V%7D%5B104%5C%20cm%5E%7B-3%7D%5Ctimes%201200%5C%20cm%5E2%2FV%5C%20s%2B1016%5C%20cm%5E%7B-3%7D%5Ctimes%20500%5C%20cm%5E2%2FV%5C%20s%5D)
or
Current, 
A is the area of bar, 
So, 
Current, 
<em>So, the current flowing in silicon bar is </em>.
I am pretty sure that according to the<span> information represened above, we can determine the car's </span><span>speed. It is usual thing in physics tasks and when we are provided with such values, we can immediately reveal the characteristic of the speed. Hope it helps!</span>
Answer:
An atomic nucleus consists of protons and neutrons, collectively called nucleons. Although protons repel each other, the nucleus is held tightly together by a short-range, but very strong, force called the strong nuclear force. A nucleus has less mass than the total mass of its constituent nucleons.
Explanation:
Answer:
makes a transition from a high to a lower energy state
Explanation:
The emission spectrum is the spectrum of electromagnetic radiation emitted due to the transition from a state of high energy to a state of lower energy made by an electron in the atoms of the chemical element or compound. The emitted photons have an energy equal to the difference in energy between the two states.
The product of (wavelength) x (frequency) is always the same number ... the wave's speed.
So if the wavelength is somehow reduced to 1/4 its original length, the <em>frequency is immediately multiplied by 4</em> . That's the only way their product can remain the same.
