hertz is a unit of: - sound frequency decibel is a unit of: - sound intensity the frequency of sound is perceived as: - pitch what is the first thing you should do when fitting earplugs? - a. pull the top of the ear to align the ear canal b. roll the earplug down into a tight, crease-free cylinder c. CHECK THE EAR CANAL FOR ANY OCCLUSIONS d. insert the earplug deep into the ear canal hearing tests do not have to be conducted in a sound booth as long as maximum allowable ambient noise le...

AQA AS PHYSICS 7407/1 Paper 1 2021 MS AS PHYSICS 7407/1 Paper 1 Mark scheme June 2021 Version: 1.0 Final MARK SCHEME – AS PHYSICS – 7407/1 – JUNE 2021 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates participate in and is the scheme which was used by them in this examination. The standardisa...