Electromagnetic Radiation - Chalk Talk

The video explains how energy travels through space as electromagnetic radiation, which behaves like a wave moving at the speed of light. This is how the sun's energy reaches Earth. Electromagnetism, one of the four fundamental forces, is crucial for electricity and magnetism. Electromagnetic radiation is categorized by frequency, with different frequencies serving various purposes, from gamma rays to radio waves, including visible light. The electromagnetic spectrum encompasses all possible wave frequencies.

How does energy from the sun reach Earth?

• Via electromagnetic radiation

• By gravitational pull

• Through convection currents

• Through sound waves

Why is electromagnetism considered a fundamental force?

• It only affects metals

• It is the weakest force in nature

• It is responsible for gravity

• It influences a wide range of phenomena

What would be missing without electromagnetism?

• Chemical reactions

• Thermal energy

• Electricity and magnetism

• Nuclear energy

How is electromagnetic radiation classified?

• By its color

• By its temperature

• By its frequency

• By its speed

Which of the following is part of the electromagnetic spectrum?

• Sound waves

• Seismic waves

• Gamma rays

• Ocean waves