Unit 1 Quiz Study Guide
Label the examples of convection, radiation, conduction, absorption, and reflection shown in the
diagram.
Explain why the ground surface warms up during the day and cools off at night.
During the day energy from the sun is absorbed by surfaces and converted to infrared energy. At
night no energy from the sun is available for conversion of light to heat energy. The surfaces
radiate heat into the cooler air above the surface. As the surface loses heat energy, it cools.
Why does warm air rise and cold air sink?
When air is warmed by surfaces, molecules in air spread out becoming less dense. The less
dense air rises. When molecules in air lose heat, they move closer together becoming more
dense. More dense air sinks.
Whis is the name of the process that bends
light and separates white light into color
bands?
The process is called refraction, the bending
of light as it passes from air through a solid or
liquid medium.
What color of light has the longest wavelength? Red has the longest wavelenth.
What color of light has the shortest wavelength? Violet has the shortest wavelength.
What is the relationship between wavelength and frequency?
As the wavelength decreases, the frequency increases. Violet has the shortest wavelength and
highest frequency of visible light.
What type of light can the unaided human eye see?
The unaided human eyes sees only reflected visible light
Unit 1 Quiz Study Guide
What would happen to an inflated balloon if it were placed in a freezer? Why?
The molecules of gas that make up air slow down and do
not exert as much pressure. The volume of air is the
same, but because the molecules of gas do not exert as
much pressure the volume of the balloon decreases.
Describe and explain what happens when the temperature of a gas increases, but the volume is
kept constant.
When the temperature of a gas increases the gas
molecules gain more kinetic energy. The molecules collide
more frequently with the sides of the container. If the
volume is constant, then the pressure increases.
Describe and explain what happens to the temperature of a gas when more gas molecules are
pumped into a fixed volume container.
When more gas molecules are pumped into the
container, the pressure increases if the volume is
constant. The molecules collide more frequently and the
temperature increases.
What is mass? What is the standard unit of mass? Mass is the amount of matter in a substance.
The standard unit of mass is the kilogram.
What is volume? What is the standard unit of volume? Volume is the space an object occupies.
The standard unit of volume is the cubic meter.
What is density? Density is the amount of matter in a given space or mass per volume.
If volume is allowed to change with temperature, how does increasing the temperature fo a gas
affect the density of a gas? Increasing the kinetic energy of the gas and allowing the gas
particles to spread out decreases the density of the gas.
What is pressure? Pressure is the force exerted by a substance over a given area.
If volume is constant, how does changing the mass of a gas affect pressure? Add more
molecules of gas to a fixed volume container increases the mass of the gas. The increased mass
exerts more force per area of the container walls.