Four sound sources

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Four sound sources, each with sound level

10\,\mathrm{dB}

, are sounded together in phase. The resultant intensity level is given that

\log_{10}2=0.3

: (1)

40\,\mathrm{dB}

(2)

26\,\mathrm{dB}

(3)

22\,\mathrm{dB}

(4)

13\,\mathrm{dB}