October 2018 1 111 Report
Suatu sumber bunyi brgerak dngn kec 10. m/s menjauhi seorang pndngar yg tdak brgrk . jka frek bunyi 400 Hz , & kec perambatannya 390 m/s , mka frek gelmbng bunyi yg trdngar adlh. ..
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