What is the difference between these 2 pictures

What is the difference between these 2 pictures?

Loudness (_____)

Intensity is related to theamount of energy involved

Alexander Graham Bell…inventor of the ______

Intensity scale is measured by d. B (______)

d. B are considered a logarithmic scale Source Intensity Level # of Times Greater Than TOH Threshold of Hearing Rustling Leaves Whisper Normal Conversation Busy Street Traffic Vacuum Cleaner Large Orchestra Walkman at Maximum Level Front Rows of Rock Concert Threshold of Pain Military Jet Takeoff Instant Perforation of Eardrum 0 d. B 10 d. B 20 d. B 60 d. B 70 d. B 80 d. B 98 d. B 100 d. B 110 d. B 130 d. B 140 d. B 160 d. B 100 101 102 106 107 108 109. 8 1010 1011 1013 1014 1016

A logarithmic chart…for every increase in d. B level, the increase in intensity (loudness) increases by a power of 10 On the decibel scale, the smallest audible sound (the threshold of hearing) is 0 d. B. A sound 10 times more powerful is 10 d. B. A sound 100 times more powerful than near total silence is 20 d. B A sound 1, 000 times more powerful than near total silence is 30 d. B.

Review A mosquito's buzz is often rated with a decibel rating of 40 d. B. Normal conversation is often rated at 60 d. B. How many times more intense is normal conversation compared to a mosquito's buzz? __________

AP Physics Sound is a form of energy. The intensity of sound is the amount of energy per second falling on a surface,

Most sound sources distribute their sound equally in all directions, producing a spherical pattern.

The mathematical relationship between intensity and distance is sometimes referred to as an inverse square relationship. Can you name the other inverse-square laws? 1) Newton’s 2)Electric Universal law of gravitation 3)Magnetism 4)Sound 5)and Radiation (Light)

Formulas Intensity = Power �� r² 4 Unit: Watt/m²

Source Intensity Level Threshold of Hearing (TOH) 1*10 -12 W/m 2 0 d. B Rustling Leaves 1*10 -11 W/m 2 10 d. B Whisper 1*10 -10 W/m 2 20 d. B Normal Conversation 1*10 -6 W/m 2 60 d. B Busy Street Traffic 1*10 -5 W/m 2 70 d. B Vacuum Cleaner 1*10 -4 W/m 2 80 d. B Large Orchestra 6. 3*10 -3 W/m 2 98 d. B Walkman at Maximum Level 1*10 -2 W/m 2 100 d. B Front Rows of Rock Concert 1*10 -1 W/m 2 110 d. B Threshold of Pain 1*101 W/m 2 130 d. B

Practice A fog horn blows with the power 1000 W. What will be the sound intensity at a distance of 20 m? Solution: Using I = P/(4πr 2) I = 1000 watts / (4π ∙ 20. 02 m 2) = 0. 199 watts/m 2.