Use this technique to find a formula for the intensity i of a sound, in terms of the sound level β and the reference intensity i0. there will be a quantity (10 db) involved in your calculations. when you enter your answer, leave off the unit db.

Explanation:

As we know that sound level is given as

so here we have

now we can take anti log both sides

so we have

so above is the expression for the intensity of sound in terms of reference intensity and sound level

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

answer: the answer is a