Unit 2 BOW Pretest

SC.8.E.5.10

Scientists use light years to describe relationships between objects in space. What does a light year measure?

• the time it takes for light to travel 1 million km

• the number of years it takes for light to travel to earth

• the brightness of the light that travels through space

• the distance that light can travel in a year

SC.8.E.5.1

All electromagnetic waves travel through space at the speed of light, 9.46 trillion kilometers per year. Visible light and radio waves are both electromagnetic waves. Imagine that an interstellar probe could travel 9.46 trillion kilometers in space. The probe sends radio signals back to Earth so that ground controllers can track it. How long would it take for the probe's radio signals to reach radio receivers on Earth?

• 9.46 trillion years

• six months

• one year

• 9.46 years

SC.8.E.5.11

The transfer of energy as electromagnetic waves is called radiation. Not all electromagnetic waves emit the same radiation. What determines the radiation that an electromagnetic wave emits?

• its speed

• its amplitude

• its visibility

• its wavelength

SC.8.E.5.11

There are telescopes made to detect all kinds of electromagnetic waves so that images can be created from the data they collect. For example, radio telescopes detect radio waves and X-ray telescopes detect X-rays. What type of electromagnetic radiation do optical telescopes detect?

• ultraviolet light

• microwaves

• infrared light

• visible light

SC.7.P.10.1

The energy from the sun arrives as electromagnetic radiation with a wide range of wavelengths and frequencies. Of the four types listed, which has the lowest frequency?

• x-ray waves

• ultraviolet waves

• infrared waves

• visible light waves

SC.7.P.10.2

Tyler observed that light can be reflected, absorbed, and refracted. What causes the refraction of light?

• light waves move at different speeds through different materials

• light waves can have different wavelengths and different frequencies

• light waves maintain the same speed while traveling through a different material

• light waves travel extremely fast

Tags

NGSS.MS-PS4-2

SC.7.P.10.3

In which of these situations would light slow down?

• from plastic to air

• from ice to water

• from glass to air

• from vacuum to air

Tags

NGSS.MS-PS4-2

SC.7.P.10.3

Sound waves can move at different speeds. What can affect the speed at which sound waves travel?

• the distance over which the sound waves travel

• the material through which the sound waves travel

• the frequency of the sound waves

• the amplitude of the sound waves

Tags

NGSS.MS-PS4-2