Author Question: The charge carried by one electron is e = -1.6 10-19 C. The number of excess electrons necessary to ... (Read 76 times)

cnetterville · **on:** Jul 27, 2018

The charge carried by one electron is e = -1.6 10-19 C. The number of excess electrons necessary to produce a charge of 1.0 C is

A) 6.3 1018.
B) 1.6 1019.
C) 6.3 109.
D) 6.3 106.
E) 1.6 1018.

Question 2

One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900C; exhaust temperature = 430C. 7 109 cal of fuel produces 1.4 1010 J of work in one hour.

(a) What is the actual efficiency of this engine?
(b) What is the Carnot efficiency of this engine?