A resistor with no battery hisses. What is that hiss?

• Quantum tunneling only
• Thermal equilibrium noise
• A broken contact

What equals the energy variance in the canonical ensemble?

• Temperature squared times heat capacity
• Temperature divided by heat capacity
• Heat capacity alone

Relative fluctuations shrink as the system grows.

Circle one:   True   False

Two samples differ only in heat capacity. Which swings more in energy?

• The one with smaller heat capacity
• Both swing identically
• The one with bigger heat capacity

You measured the rest noise across a resistor. What else do you know?

• Its resistance when driven
• Its length in meters
• Its manufacturing date

A driven measurement gives the response. What can you predict without new data?

• The equilibrium noise
• The exact microstate
• The system age

A nanosystem and a bulk sample share a material. Which swings more, relatively?

• The bulk sample
• Both swing equally
• The nanosystem

A student says the hiss needs a battery. What is wrong?

• Batteries silence all noise
• Equilibrium agitation needs no drive
• Resistors never show resistance