Front

What is the melting point of a substance?

Back

The temperature at which a solid becomes a liquid.

Front

What is the relationship between light intensity and photoelectron emission?

Back

Increasing the intensity of light increases the number of photoelectrons emitted.

Front

What is a gas spectrum?

Back

A spectrum that shows the wavelengths of light emitted or absorbed by a gas.

Front

What is the boiling point of a substance?

Back

The temperature at which a liquid becomes a gas.

Front

What energy transformation occurs when a candle burns?

Back

Chemical energy is transformed into thermal and light energy.

Front

Define thermal energy.

Back

The total kinetic energy of particles in a substance, related to temperature.

Front

What is the difference between wavelength and frequency?

Back

Wavelength is the distance between successive peaks of a wave, while frequency is the number of waves that pass a point in one second.

Front

What is the significance of the heating curve in phase changes?

Back

It illustrates how temperature changes as a substance transitions between solid, liquid, and gas phases.

Front

What is chemical energy?

Back

Energy stored in the bonds of chemical compounds, which can be released during a chemical reaction.

Front

What is the principle of conservation of energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.