Why do we take 3db bandwidth?

Related questions

1. How loud is a speaker?
2. Do you need an amp for speakers?
3. How loud is a 3db increase?
4. What is 3db frequency?
5. Is a 100 increase doubling?
6. What is difference between dBm and dB?
7. What is a good wireless signal strength dBm?
8. What is good signal strength for 4g?
9. What is ERP in wireless?
10. What is 3db rule?

Tags

1. #707max
2. #power
3. #corresponding
4. #voltage
5. #decreasing
6. #point
7. #bandwidth
8. #considered
9. #maximum
10. #decrease
11. #signal
12. #determine
13. #actually
14. #frequency
15. #magnitude
16. #known
17. #system