Hey I have 3 questions to ask and I've done both of them, i just want to know if I did it right or wrong.
1. On September 26, 2001, an earthquake in North Bay measured 5.0 on the Richter scale. What is the magnitude of an earthquake 3 times as intense as North Bay's earthquake?
The answer I got was 5.477
2. How much louder is a mp3 player (100dB) to a crying baby (80dB)?
The answer I got was approx 10 (9.69)
3. A liquid has a pH of 3.46. Find the hydrogen ion concentration [H+].
The answer I got was 10^-3.64 which is .000229
Basically the work for this process I did:
PH = -logH^+
H^+ = 10^-3.64
H^+ = .000229
So are these answers right? For the last one did I show the correct process? Thanks