Amplitude and Energy Formula

Amplitude and Energy Formula

A Review

What is amplitude?

• Amplitude is how high the wave will move when it is not at rest.

• The more amplitude a wave has, the more energy it will create.

Amplitude examples

• A higher wave during a tsunami causes greater destruction.

• A louder sound wave can cause hearing damage.

Amplitude examples

• A higher wave during a tsunami causes greater destruction.

• A louder sound wave can cause hearing damage.

How can we calculate the energy output for wave amplitude?

• We can use the formula...

   $a2$  2

• OR  (A x A) x 2

In plain English, please...

• A or a stands for the amplitude of the wave.

• 2 is 2...just like in math or everyday use.

• To find the units of energy for the wave, multiply the amplitude times the amplitude. Then multiply that answer by two.

Let's look at an example

• Let's say the amplitude of a wave is 5.

• We would multiply 5 x 5, which equals 25.

• Next multiply 25 x 2.

• If you followed all of the steps, you probably have an answer in mind. When you think you know, continue to the next screen.

Multiple Choice

What answer did you get?

• 10

• 15

• 25

• 50

Let's try a few more for practice

• REMEMBER...

• amplitude x amplitude

• multiply that answer times two

Multiple Choice

Example: Amplitude of 2...to find the energy think: (2 x 2) x 2, so you'd get an answer of 8.

Here's yours to try...the amplitude is 3

• 9

• 18

• 27

Multiple Choice

amplitude of 6 gives an energy output of...

• 12

• 72

• 18

Multiple Choice

amplitude of 4 gives an energy output of...

• 8

• 12

• 16

• 32

Just remember...A (amplitude) is a variable. You can substitute any number for A and find the energy output answer.

• (A x A) x 2