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### Wave Basics

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Question 1 0:13
• Question 2 0:36
• Question 3 0:47
• Question 4 1:13
• Question 5 1:27
• Question 6 1:39
• Question 7 1:54
• Question 8 2:22
• Question 9 2:51
• Question 10 3:32

### Transcription: Wave Basics

Hi everyone and welcome back to Educator.com.0000

In this mini-lesson, we are going to go over page 1 of the APlusPhysics worksheet on wave basics.0003

You can find a link to that worksheet down below the video.0008

Let us dive right in.0011

Which type of wave requires a material medium through which to travel?0013

Well, waves that require a material medium are mechanical waves and the mechanical wave here is sound.0017

It needs to go through air or water or metal. It will not travel through a vacuum.0023

These other three are all electromagnetic waves. They will travel through a vacuum. They do not need a medium.0029

Number 2 -- A single vibratory disturbance moving through a medium is called a...?0035

A pulse, which is one of our vocabulary words from our wave basics lesson.0041

Number 3 -- The diagram below represents a transverse wave traveling to the right through a medium.0047

Point (A) represents a particle of the medium.0052

In which direction will particle (A) move in the next instant of time?0054

Well, right away, since it is a transverse wave and its velocity is to the right, we know that (A) can only move up or down and as the wave travels to the right, (A) is going to go down next.0058

So our correct answer there must be Number 2.0068

Number 4 -- As a transverse wave travels through a medium, the individual particles of the medium move perpendicular to the direction of wave travel.0073

That is the definition of a transverse wave.0082

Number 5 -- A periodic wave transfers -- Well waves transfer energy. Our answer is 1 energy only.0087

Number 6 -- Which type of wave requires a material medium, through which to travel?0100

Well, waves that require material medium are known as mechanical waves.0104

These other three again are all electromagnetic waves that do not require a medium.0108

Number 7 -- A ringing bell is located in a chamber.0114

When the air is removed from the chamber, why can the bell be seen vibrating, but not be heard?0118

Well, the reason is that light waves can travel through a vacuum.0123

They do not need a medium, but sound does.0127

If you take all the air out of there, you have probably gotten rid of most of the medium through which the sound can travel, so light can travel through a vacuum, but sound cannot, so Number 1 must be our best answer.0129

Number 8 -- Which statement correctly describes one characteristic of a sound wave?0142

A sound wave can travel through a vacuum -- No, that is not it.0147

A sound wave is a transverse wave. That is also not true, as sound waves are longitudinal or compressional.0151

The amount of energy a sound wave transmits is directly related to the wave's amplitude.0156

That is true. Amplitude corresponds to the energy of a sound wave. The correct answer is Number 3.0162

Number 9 -- A television remote control is used to direct pulses of electromagnetic radiation to a receiver on a television.0171

This communication from the remote control to the television illustrates that electromagnetic radiation is a longitudinal wave -- No, EM waves our transverse...0178

...possesses energy inversely proportional to its frequency -- No, it is going to be directly proportional to the frequency.0189

It diffracts and accelerates in air. No, it goes at a constant speed in air -- 3 × 108m/s.0195

It transfers energy without transferring mass. Yes, waves transfer energy. Correct answer there is Number 4.0203

Last one -- The diagram below represents a transverse water wave propagating toward the left.0211

A cork is floating on the water's surface at point (P).0217

In which direction will the cork move as the wave passes point (P)?0221

Again, it is a transverse wave, so the direction of the cork, must be perpendicular to the waves velocity or up and down.0224

As the wave moves through the left, our cork is going to go down, then up, then back down, so our answer must be Number 2.0232

Hopefully, that gets you a good start on wave basics.0243

If this went great -- Terrific -- Go ahead and keep moving on.0246

These are not quite at the level of AP questions, but at least it checks a fundamental understanding.0249

If it did not go well, now would be a great time to go back and review the lesson on wave basics.0254

Thanks so much for your time everyone and make it a great day!0258