A certain crying baby emits sound with an intensity of 8.0 × 10-8 W/m2
What is the intensity level due to a set of five such crying babies, all crying with the same intensity? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB
B) 69 dB
C) 56 dB
D) 49 dB
E) 36 dB
C
You might also like to view...
A 15-?F capacitor and a 30-?F capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-?F capacitor?
a. 0.70 mC b. 0.80 mC c. 0.50 mC d. 0.60 mC e. 0.40 mC
A ideal gas constant volume gas thermometer has pressure 2.00 atm at the triple point of water. What is the pressure when the temperature in the thermometer is 500°C?
A) 3.66 atm B) 1.63 atm C) 5.65 atm D) 5.98 atm E) 4.23 atm
A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B, as shown. Points A and B are 1.5 m apart. If the kinetic energies of the block at A and B are 5.0 J and 4.0 J, respectively, how much work is done on the block by the force of friction as the block moves from A to B?
a.
?3.3 J
b.
+1.3 J
c.
+3.3 J
d.
?1.3 J
e.
+4.6 J
Radioactivity Basics: A sodium-22 nucleus, 
Na, decays into a neon-22 nucleus, 
Ne, and one other particle. What is the other particle?
Fill in the blank(s) with the appropriate word(s).