The decibel is the unit of sound level, which is a convenient way of representing the large range of sound intensities that the ear can detect. from the definition of the decibel we can see that increasing the sound intensity by a factor of ten results in:

Increase of ten yields 10 dB increase

Explanation:

The decibel is a logarithmic scale that shortens a large range of numbers into smaller and more manageable numbers. The decibel is found using:

Where r represents a ratio of a measured magnitude (pressure or intensity level in sound) to a reference pressure or intensity value. However, in our problem we only need to represent an increase factor of ten:

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

the answer to this question is 60 n