1. A speaker produces sound at a rate of power equal to 1256Watts. What is the d

Question

1. A speaker produces sound at a rate of power equal to 1256Watts. What is the decibel level of the sound at 100maway? A) 140 dB    B) 100dB    C) 12.56 dB    D) 11dB
2. A car passes at 200 km/hr blowing a horn which has a frequencyof 2000 Hz. By how much does the frequency change when the carpasses? A) 326 Hz   B) 280Hz    C) 652 Hz    D) 389Hz
3. A steel meter stick with coefficient of linear expansion11x10-6/°C is used to measure a material withcoefficient 5.5x10-6/°C. What is the % changein what the meter rod measures as the temperature rises from20°C to 40°C?    A)1%        B).01%    C) 50%      D).033% 1. A speaker produces sound at a rate of power equal to 1256Watts. What is the decibel level of the sound at 100maway? A) 140 dB    B) 100dB    C) 12.56 dB    D) 11dB
2. A car passes at 200 km/hr blowing a horn which has a frequencyof 2000 Hz. By how much does the frequency change when the carpasses? A) 326 Hz   B) 280Hz    C) 652 Hz    D) 389Hz
3. A steel meter stick with coefficient of linear expansion11x10-6/°C is used to measure a material withcoefficient 5.5x10-6/°C. What is the % changein what the meter rod measures as the temperature rises from20°C to 40°C?    A)1%        B).01%    C) 50%      D).033%

Explanation / Answer

1 . SIL = 10 log10 (Wsource/Wreference ) - 20log10(r) - 11 dB             = 10 log10 ( 1256/10-12 ) -20 log10(100) - 11 dB             = 100 dB

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