1. What is the value of x in logx 3 =-? А. 1 В. 3 С.9 D. 27
Multiple Choice. Choose the letter of the correct answer. Include your solutions.
1) What is the value of x in logx 3 = 1/3?
A. 1 B. 3
C. 9 D. 27
2) An earthquake has an intensity of 10^7.1 x I0. What is its magnitude using the Richter scale?
A. 2.9 B. 7.1 C. 8.5 D. 10
3) What is the pH of an aqueous solution when the concentration of hydrogen ion is 6.5 x 10^-5 M?
A. 4.19 B. 5.05 C. 5.65 D. 6.50
4. Calculate the concentrations of H+ in the pure water solution with pH = 6.90.
A. 1.10 x 10-8 M C. 1.25 x 10-5 M
B. 1.15 x 10-6M D. 1.26 x 10-7 M
5. What is the decibel rating of the sound of an orchestra playing a movement for fortissimo at 3.6 x 10^-5 W/m^2?
A. 76 dB B. 87 dB C. 92 dB D. 98 dB
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