IB MAI HL Functions Topic 2.2 Applications of Functions (id: ca953234a)

本题目来源于试卷: IB MAI HL Functions Topic 2.2 Applications of Functions，类别为 IB数学

[填空题]
The sound intensity level7v,fsz7 iby q9, D, in decibels (dB), cn k )1d8ry,5/gzvsbmvan be modelled by the function zrb)vkn8 gv /dmy1s,5
D(I)=10$log_{10}​$(I)+120,I≥0,
where I is the sound intensity, in watts per square meter (W /$m^2$).
1.A vacuum cleaner has a sound intensity of 1.6$\times10^{−5}$ W /$m^2$. Calculate the intensity level of the vacuum cleaner. D =    dB
2.A fire truck siren has an intensity level of 124 dB. Find the sound intensity of the siren. I ≈    W /$m^2$

参考答案:
空格1: 72±2%  空格2: 2.51±2% 


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