Electromagnetic Waves and Telescopes Flashcard- from SAVVAS

Front

What are electromagnetic waves?

Back

Electromagnetic waves are waves that can travel through the vacuum of space and consist of oscillating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the difference between AM and FM radio waves?

Back

AM (Amplitude Modulation) radio waves vary in amplitude, while FM (Frequency Modulation) radio waves vary in frequency. AM waves can travel longer distances, while FM waves provide better sound quality.

Front

How do wavelength and frequency relate to electromagnetic waves?

Back

Wavelength and frequency are inversely related; as the wavelength increases, the frequency decreases, and vice versa. This relationship is described by the equation: speed = wavelength × frequency.

Front

What type of electromagnetic wave is used in visible light?

Back

Visible light is a type of electromagnetic wave that has wavelengths between approximately 400 nm (violet) and 700 nm (red). It is the only part of the electromagnetic spectrum that can be seen by the human eye.

Front

What is the significance of infrared waves?

Back

Infrared waves are used in various applications, including remote controls, thermal imaging, and night vision. They have longer wavelengths than visible light and can be felt as heat.

Front

What are the characteristics of X-rays?

Back

X-rays are high-energy electromagnetic waves with very short wavelengths. They can penetrate most materials, making them useful for medical imaging and security scanning.

Front

What happens to electromagnetic waves as they pass through different materials?

Back

Electromagnetic waves can be absorbed, reflected, or refracted when they pass through different materials, depending on the material's properties and the wave's frequency.

Front

What is the role of telescopes in observing electromagnetic waves?

Back

Telescopes collect and focus electromagnetic waves (such as visible light, radio waves, or X-rays) from distant objects, allowing astronomers to study their properties and gather information about the universe.

Front

How do radio waves travel through the atmosphere?

Back

Radio waves can travel long distances through the atmosphere due to their longer wavelengths, which allow them to diffract around obstacles and follow the curvature of the Earth.

Front

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

Back

The energy of electromagnetic waves is directly proportional to their frequency; higher frequency waves (like X-rays) carry more energy than lower frequency waves (like radio waves).