Decibel (Symbol: dB) is a logarithmic unit that indicates ratio or gain. Decibel is used to indicate the level of acoustic waves and electronic signals. The logarithmic scale can describe very big or very small numbers with shorter notation. ...
dBZA unit used in electrical engineering and acoustics to express the ratio between two values with the same dimensions. The quantities compared may be two power levels, two voltages, two sound pressure levels, and so on. Since the quantities in the ratio always have the same dimensions, the...
Helpstudents finish “Lets check” of this unit to check the knowledge students havelearned in this period. step5 Summarize Reviewthe grammar box and show the key points step6 Homework Writing/ continue the story / recite / retell Purpose:Revision is so important that students should speak Engli...
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