8th grade Waves Quiz Flashcards

What is a wave?

A wave is a disturbance that transfers energy through space or matter, typically in the form of oscillations or vibrations.

What does a wave not transfer

Matter

What do Waves transfer

Energy

What are the 3 types of mechanical waves

Transverse, longitudinal, and surface waves.

What is Amplitude

height of the wave from its resting point to its highest point (crest) or lowest point (trough). 

What does amplitude mean

The amount of energy in a wave

Wavelength

Distance from crest to crest or through to through,

Frequency

the number of waves that pass a point in a given time period.

Crest

Highest point in a wave

Through

lowest point in the wave

What is a Medium

the substance or material through which a wave travels, such as air, water, or solid materials.

What type of motion do surface waves have?

A circular motion

How is amplitude related to wave energy?

Proportional

How is frequency related to wave energy?

Proportional

How do devices use waves to create energy?

Devices convert wave energy into electrical energy, using mechanisms like turbines, piezoelectric materials, or photovoltaic cells to harness the kinetic or potential energy of the waves.

Do seismic waves travel faster in more dense rocks or less dense rocks?

Travel faster in more dense rocks

Does the refracted wave move closer to 90 degrees (normal line) or does it move further away from 90 degrees (normal line) with the boundary in a denser medium?

The refracted wave moves closer to 90 degrees (normal line) when it enters a medium with a greater density.

Do sound waves travel faster in solid, liquid or gas?

Travels fastest in solids, then liquid, then gas

Does the refracted wave move closer to 90 degrees (normal line) or does it move further away from 90 degrees (normal line) with the boundary when it passes from air to liquid?

The refracted wave moves closer to 90 degrees (normal line) when it passes from air to liquid.

What is Refraction

Refraction is the bending of a wave as it passes from one medium to another, caused by a change in velocity due to the difference in density between the two media.

What is Reflection

Reflection is the bouncing back of a wave when it encounters a barrier or a boundary between two different media, maintaining its energy.

What is absorption

Absorption is the process by which a wave's energy is taken up by a medium, converting it into other forms of energy, such as heat.

What is Difraction

Diffraction is when waves bend around objects

What is total internal reflection

complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium

How does light react when it moves into mediums with different densities?

Light bends or refracts at the boundary between the two mediums, changing speed and direction.

How does light react when it moves into mediums with different densities?

It changes direction

In terms of speed, what does it mean when the refracted wave is bent up or bent down?

When it bends up that means it is increasing in speed when it bends down that means its decreasing in speed

What are the different forms of Electromagnetic waves?

Radio,Microwave,Infrared,Visible, X-rays,Gamma Rays, and Ultra Violet

What types of EMR do cell phones use to transmit information?

Radio

What is needed for sound waves to move between objects?

A medium

What happens to sound in a vacuum

It cant go through a vacuum as it needs a medium to move

What happens to sound as it travels between mediums with different densities?

It speeds up or slows down

Sound travels the fastest through ______ mediums

Denser

Light travels fastest through _______ mediums

Less dense

What are Analog Signals

C signals that can vary smoothly over time, representing information as a continuous range of values

What are digital signals

represent data using a sequence of discrete values, typically as a series of 0s and 1s (binary code)

How are Analog and Digital signals similar?

They both transmit info, Both use frequency and amplitude to measure, Both used to convey a variety of info

How are Analog and Digital signals different?

Analog is continuos e and Digital is binary in ones and zeros, Analog is sine(S curved) waves and Digital is square waves, Analog is affected heavily by noise and radio while digital is not, Digital is more expensive while Analog is less expensive

What is more reliable: Analog or Digital?

Digital because it can relay over farther distances, can relay more info, and is more accurate

How are analog and digital waves represented?

Analog waves are smooth and continuous, digital waves are stepping, square, and discrete.

How does information travel using digital signals? 

Using binary, 1s and 0s

What is the equation for waves

Wave speed= Frequency x Wave Legnth