24 7th Comprehensive Science 2nd Nine Weeks Review

Front

What happens when a hot object is placed in a cold substance?

Back

Heat flows from the hot object to the cold substance, causing the cold substance to change state (e.g., ice cream melts).

Front

What is infrared radiation commonly used for?

Back

Infrared radiation is used in heat vision goggles to detect heat emitted by objects.

Front

What does the Law of Conservation of Energy state?

Back

Energy cannot be created or destroyed; it can only be transformed from one form to another.

Front

Why do sound waves travel slower in gases than in solids?

Back

Sound waves travel slower in gases because the molecules in gases are farther apart, making it harder for the sound to transfer.

Front

What is the relationship between frequency and energy in electromagnetic waves?

Back

If frequency increases, energy increases.

Front

Define conduction.

Back

Conduction is the transfer of heat through direct contact between materials.

Front

Define convection.

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases).

Front

Define radiation.

Back

Radiation is the transfer of energy through electromagnetic waves without the need for a medium.

Front

What is the difference between potential energy and kinetic energy?

Back

Potential energy is stored energy based on position, while kinetic energy is the energy of motion.

Front

What is the formula for calculating kinetic energy?

Back

Kinetic energy (KE) = 1/2 mv², where m is mass and v is velocity.