CAPE Physics Unit 1 · 2017 · Paper 1 · Question Q29

How much intensity change in dB will take place with an increase in intensity from 1\text{ mW m}^{-2} to 100\text{ mW m}^{-2}?

1. (A)2\text{ dB}
2. (B)3\text{ dB}
3. (C)20\text{ dB}
4. (D)30\text{ dB}