Beyond Our World Review

To describe the vast distances between stars, astronomers use ______________________, or the distance light travels in one year.

• kilometers

• astronomical units (AU)

• light-years

• miles

Astronomers also use the distance between Earth and the Sun as a base unit of measuring distances - usually within star/solar systems. These are known as ________________________.

• light-years

• miles

• astronomical units (AU)

• kilometers

The sun emits all types of ____________________________ radiation, including radio, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays.

• electromagnetic

• visible

• gravitational

• cosmic

____________________ waves are a type of electromagnetic radiation best known for their use in communication technologies, such as television, mobile phones and radios.

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____________________ come second in the electromagnetic spectrum. They're used for weather, cooking, and radar. They are also used for GPS systems.

____________________ can be useful to determine the temperatures of objects from a distance. It is also used by electrical heaters, cookers for cooking food, short-range communications like remote controls, optical fibres, security systems and thermal imaging cameras which detect people in the dark.

• Radio

• Microwave

• X-Rays

• Infrared

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Refracted _____________________ from the sun contains all of the colors that we can see.

• radiation

• sound

• invisible light

• visible light

_____________________ can cause sunburns, and is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.

• Gamma rays

• X-rays

• Ultraviolet rays

• Microwaves

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Unlike light, _____________________ have higher energy and can pass through most objects, including the body. They are used in medicine to generate images of tissues and structures inside the body.

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_______________________ consist of the shortest wavelength electromagnetic waves, and so they have the highest wave energy.

• Gamma rays

• X-rays

• Ultraviolet rays

• Microwaves

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