Irr a particular semiconductor there are 1013 donors/cm3wit11 a11 iomizatio~r energy Ed of 1 meV and an effective mass 0.01 m. (a) Estimate thecoricrrrtratio~l of curlduction electrons at 4 K. (b) What is the value of the Hall coeff-icelit? Assurne no acceptor atoms are present and that Eg % kgT

2. they have negligible mass.

No because scientist are still changing there mines today so they are not correct to this day

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction