Skip to content

Course home

Scientific processes

Scientific processes

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314
Question 239

Acoustic Insulation Core Material Study

An acoustic engineer designed an experiment to evaluate the sound-dampening efficacy of three different structural insulation core materials.

A total of 24 identical soundproof test chambers were prepared. Each chamber was fitted with a wall panel utilizing one of the three core materials:

  • Group P used panels with a recycled cellulose core.
  • Group Q used panels with an aerated polymer foam core.
  • Group R used panels with a dense mineral wool core.

A constant external acoustic noise source of 95 decibels (dB) at a frequency of 1000 Hz was projected at the outer face of each panel for 10 minutes. The engineer measured the sound pressure level (in decibels) transmitted to the interior of each chamber.

Identify the dependent variable in this study.

[1]
Markscheme

Scientific processes Questions

  1. A Level
  2. /Psychology
  3. /Scientific processes

689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank