Electromagnetic Waves - Study Guide

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How do electromagnetic waves begin?

An electromagnetic wave begins when an electrically charged particle vibrates, causing the electric field surrounding it to vibrate as well. The electric field then creates a vibrating magnetic field. Both the electric field and magnetic field combine to create an electromagnetic wave.

We use electromagnetic waves for _____, _____, _____, and many other purposes.

communications, cooking, medicine

The energy of an electromagnetic wave is _____ as it spreads out over an ever-larger area as it travels away from the source.

diluted

An _____ is an area of electrical force surrounding a charged particle.

electric field

____ is the transfer of energy by waves traveling through matter or across empty space.

electromagnetic radiation

An _____ is a wave that consists of vibrating electric and magnetic fields.

electromagnetic waves

The amount of energy in a photon depends on the _____of electromagnetic radiation.

frequency

Examples of electromagnetic radiation include ____ and ____.

infrared light, visible light

When electromagnetic waves interact with _____, they may also convert to other forms of energy.

matter

According to Eisntein's Wave-Particle Theory, when an electron returns to a lower energy level, it is thought to give off a tiny "packet" of energy called a _____.

photon

Many other sources of electromagnetic waves that people use depend on technology, such as _____, _____, and _____.

radio waves, microwaves, X-rays

Electromagnetic waves interact with matter through _____, _____, and _____.

reflection, refraction, diffraction

The electric and magnetic fields that make up an electromagnetic wave occur are at _____ angles to each other.

right

The most important source of electromagnetic radiation on Earth is the _____.

sun

Electromagnetic waves are ____ waves that can travel across space without a medium.

transverse

Einstein's _____ explains how electromagnetic radiation can behave as both a wave and a particle.

wave-particle theory


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