On a particle level, what happens when thermal conduction occurs within a solid?
a) faster particles bump into slower particles
b)faster particles give off electromagnetic waves
c)faster particles move up, and slower particles move down
d)faster particles move even faster

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers