<p>Name: David Macmorine Contact Info: [email protected] Date:11-Jul-14</p><p>Lesson Title: What is Sound? Unit #: Lesson #: Activity #: Worksheet: b Activity Title: What is Sound? 5 1 2 Worksheet Title: Measuring Sound</p><p>Name Date Period </p><p>1. Sound is measured in a unit called Watts. Have you seen the word Watts before? In what situation?</p><p>2. A Watt is a unit of ‘energy flow’ defined as a Joule per second. What is a Joule? If you don’t know, look it up on the internet. </p><p>3. Not everyone has the same ability to hear, so the level chosen as the least amount of energy that someone can hear is taken as 10-12 Watts per meter2. Write out 10-12 as a decimal number.</p><p>4. If you were to study sound, would you like to write down numbers like #3 all the time? That is why scientists came up with the decibel scale. The definition of decibel scale is – </p><p>-12 2 -12 Where I0 = 10 watts per meter . If I = 10 calculate the dB of this sound intensity. </p><p>5. Examine the following table where the value of the sound is given in Watt per meter2 – </p><p>Calculate the dB of each of the sounds. Look for a pattern.</p><p>6. How many times louder is loud music than soft music?</p><p>1</p>