(a) (6 pts) suppose a system consists of n noninteracting, indistin guishable, identical particles and that each particle has available to it only two quantum electronic states, whose energies are 0 and a. find expressions for z, z and u. note: because we don 't consider translational energy here, so the 1/n! should be om itted when writing z in terms of z (b) (4 pts) for no, the ground electronic level and the first exited electronic level are each doubly deg enerate. the separation between these two electronic labels is 0.0149 ev. there are no other low-lying electronic levels. for no, calculate za at 150 k. note: lev 16022 * 101 j 9, (12 pts) (a) (3 pts) show that if the hamonic-oscillaor approximation is used, the fractional population of the diatomic-molecule vibrational level v is < n,> (b) (2 pts) show that z, n/ethr write downr in terms of concentration of b and c (b write downk too and [c, na a re, r, t, ma, mc ande rt2 find e d. (3 pts) using e and a.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.