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

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.