(628)-272-0788 info@etutorworld.com

Wave Interaction

Grade 7 Science Worksheets

How are waves created?

Waves are the disturbances or vibrations that are caused in a media. It is constantly being created and always traveling through different media.

Some waves need a medium (matter) to travel through and some waves can travel in empty space or vacuum.

Schedule a Free session to clear worksheet doubts

No credit card required, no obligation to purchase.
Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!

Mechanical waves

Mechanical waves are those waves which when travels transfers energy on the medium traveled.

That is the energy is transferred from one particle to another.  If there was no particle, there would be no energy transfer.

Electromagnetic waves

Waves that travel without the help of a medium are called electromagnetic waves.

Electromagnetic waves even travel in vacuum; they do not necessarily need a medium.

wave interaction

What are the different types of waves? 

There are 3 types of mechanical waves:

  • Transverse waves,
  • Longitudinal waves,
  • Surface waves.

Transverse Waves

Waves which have a tendency to travel perpendicular to an applied force are Transverse waves.  Transverse begins with the letter “T”. It looks like a perpendicular. Hence this is easy to understand.

Transverse wave can be created by tying a rope to a nail on the wall or tying one end to a tree and moving the rope up and down. We would find that the wave direction is perpendicular to our action. The wave moves towards the tree.

wave interaction

Credit: http://philschatz.com/physics-book/contents/m42248.html

The highest part of a transverse wave is called crest and the lowest point is called trough.

Here AB is the force applied and BC is the wave direction.

Therefore, the wave travels perpendicular to the force we apply. Radio waves and light waves are transverse in nature.

wave interaction

Longitudinal Waves

Longitudinal mechanical waves are waves that travel parallel to the applied force.

A longitudinal wave can be experimented with the help of a spring slinky by you and one other person. The other end can be held still while you hit your end.

You will see that the coils of the spring move close together and also far apart at the same time. Therefore we say that the longitudinal wave travels parallel to the force applied.

Sound waves are longitudinal waves too.

wave interaction

Surface Waves 

When certain waves travel along two different mediums, such as air and water or

liquids of different densities is called as surface waves.

When wind blows over. It causes wave called surface wave. These waves are totally different as compared to the other waves as it moves in circular motion.

wave interaction
We notice ripples on water and also see large gigantic waves capable of sinking large ships. These all are surface waves. One of the examples of surface waves is the tsunami which happens because of undersea earthquakes, or shift of tectonic plates. These waves can hardly be observed in the middle of the ocean, but as they reach the shore, they are in giant sizes. Some are even reaching 200 feet in height. 
wave interaction

Credit: https://commons.wikimedia.org/wiki/File:Waves_in_pacifica_1.jpg

Electromagnetic waves

Waves which travel without the help of a medium is said to be electromagnetic waves. They can travel in vacuum or empty space.

For example light, sunrays, another example is wifi routers- these send electromagnetic waves.

wave interaction

Learn more about Wave Interaction and other important topics with 7th Grade Science Tutoring at eTutorWorld. Our expert science tutors break down the topics through interactive one-to-one sessions. We also offer the advantage of customized lesson plans, flexible schedules and convenience of learning from home.

eTutorWorld Understands Math Tutoring | Online Math Worksheets are Important Tools

Understanding graphs, charts, and opinion polls in a newspaper, for calculating house and car payments, and for choosing a long-distance telephone service are impossible without strong math skills …and the only way to develop strong math skills is by constant practice.

‘Practice makes a man perfect’ holds true for no other field better than for math. A middle or high school student must set aside a minimum of an hour for math every day. Other than textbooks, worksheets help you revise and understand concepts better.

Our expert tutors prepare online maths worksheets that are age and grade-appropriate. Grade-wise math worksheets for Elementary Math, Arithmetic, Pre-Algebra, Algebra, Geometry, Trigonometry, Statistics, Pre-Calculus and Calculus can be solved to improve math skills, to get ahead or to even catch up.

You may download these FREE online math worksheets in the PDF format, and then print and email us their solutions for a free evaluation and analysis by eTutorworld’smath expert tutors.

You may solve these worksheets by yourself or with your peers while studying together.

The Answer Key at the end of each worksheet allows for a self-evaluation.

Personalized Online Tutoring

eTutorWorld offers affordable one-on-one live tutoring over the web for Grades K-12, Test Prep help for Standardized tests like SCAT, CogAT, MAP, SSAT, SAT, ACT, ISEE and AP. You may schedule online tutoring lessons at your personal scheduled times, all with a Money-Back Guarantee. The first one-on-one online tutoring lesson is always FREE, no purchase obligation, no credit card required.

For answers/solutions to any question or to learn concepts, take a FREE CLASS.

No credit card required, no obligation to purchase.
Just book a free class to meet a tutor and get help on any topic you want!

Check Point

A. Fill in the blanks –

  1. Waves are disturbances that cause………….. to vibrate.
  2. Waves that travel by transferring their energy in matter are called…………………waves.
  3. Waves that do not need a medium to travel are called ……………. waves.
  4. …………………… mechanical waves are waves that travel perpendicular to an applied force.
  5. Longitudinal waves are mechanical waves that travel ………….. to an applied force.

B. State True or False –

  1. Electromagnetic waves can travel in empty space or space that has no particles.
  2. Transverse mechanical waves are waves that travel parallel to an applied force.
  3. Longitudinal waves are the same as Transverse waves.
  4. Surface waves are waves that travel along the boundary between two different media, such as air and water or liquids of different densities.
  5. Tsunamis are huge longitudinal waves caused by shift of tectonic plates.
Answer Key

A.  Fill in the blanks –

  1. Media
  2. Mechanical
  3. Electromagnetic
  4. Transverse
  5. Parallel

B. State True or False –

  1. True
  2. False
  3. False
  4. True
  5. False

Pricing for Online Tutoring

Tutoring PackageValidityGrade (1-12), College
5 sessions1 Month$139
1 session1 Month$28
10 sessions3 months$269
15 sessions3 months$399
20 sessions4 months$499
50 sessions6 months$1189
100 sessions12 months$2249
Save 10% on ALL Tutoring Packs with Code FRESH10
10
Days
10
Hours
10
Minutes
10
Seconds
Save 10% with Code FRESH10
10
Days
10
Hours
10
Minutes
10
Seconds