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For the record: the study is worded such that the height of a sound wave is the correct cause of loudness. 
am_Unition · 3360 days ago · link ·
The same quiz a few days ago was rolled into something NPR-related that tng posted. Two of the answers to question #2 (cell phone signals) were "light waves" and "radio waves". Now they've appended it to say "visible light waves", as it should. Radio waves are certainly included under the broad spectrum of "light waves", but not in the narrow-band of "visible light". And I know you know this, 'bl00. Just doin' some record keeping.