MYP Physics 2 Heat, Light and Sound Questionbank

True or False: According to the textbook, condensation is defined as the transition from gas to liquid when water vapor cools specifically below its saturation point.

In the observation of Brownian motion, how does the size of the visible particles (such as smoke or pollen) generally compare to the size of the molecules (such as air or water) causing the motion?

In the proportionality for the rate of conduction, $\text{rate} \propto \frac{A\,\Delta T}{L}$, what does the term $L$ represent physically?

Why does the example of diamond being an excellent thermal conductor but a poor electrical conductor serve as an important note in the study of heat transfer?

When considering the design of a cooling system for an electronics cabinet, why are cooling fans often positioned to create a flow of air across the components?

True

False

The visible particles are much smaller than the invisible molecules

The visible particles are much larger than the invisible molecules

Visible particles only move when hit by particles larger than themselves

Both particles are exactly the same size

The latent heat of the substance

The luminosity of the emitting surface

The level of insulation efficiency

The length or thickness of the material through which heat travels

It proves that all insulators are actually good conductors

It suggests that diamond is a metal under high temperature conditions

It demonstrates that the link between electrical and thermal conductivity does not reliably apply to non-metals

It shows that free electrons are the only way to conduct heat

To increase the rate of conduction through the air

To increase the rate of convection by moving fluid particles

To increase the rate of radiation from the components

To eliminate the need for thermal insulation