How many times the pressure amplitude is increased, if sound level is increased by `40 dB` ?

If the intensity of sound is doubled, the sound level will increase by nearly _____ .

Sound level /loudness at any point in a room is increased from "50dB" to "60dB" by increasing the pressure amplitude, if final pressure amplitude is "K" times that of initial. Find the value of (K^(2))/(5)

If each edge of a cube is doubled, (i) how many times will its surface area increase? (ii) how many times will its volume increase?

If each edge of a cube is doubled, (i) how many times will its surface area increase? (ii) how many times will its volume increase?