Wave Interaction – Grade 7 Science Worksheets

Premium Grade 7 Science Worksheets Package ($29)

The package has 5 free Worksheets & 34 Premium Worksheets with 15 questions each.

Access Worksheet Here

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.

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.

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.

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

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.