Consider a 2 level system with ε_(1)=2.25x10^(-22) and ε_(2)=4.50x10^(-21)j.

a. at a temperature of 500k, which model (quantum mechanics of classical mechanics) is sufficient to describe this system and why?

b. if g_(2)=2g_(1) what value of t is required to obtain n_(2)/n_(1)=0.175?

c. at what temperature is quantum mechanics sufficient to describe the system?

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?