Author Question: The part of an electron microscope that plays the same role as the lenses do in an optical ... (Read 116 times)

bobbysung · **on:** Jul 29, 2018

The part of an electron microscope that plays the same role as the lenses do in an optical microscope is

A)

the vacuum chamber.
B)

the coils.
C)

the cathode.
D)

the anode.
E)

the deflector plates.

Question 2

What is the coefficient of performance of an ideal Carnot heat pump used to heat a house whose inside temperature is 24C when the outdoor temperature is -12C?

A)

8.25

B)

2.75

C)

0.67

D)

0.53

E)

5.00