By what factor must you increase the intensity of a sound in order to hear a 1.0-dB rise in the sound level?

The right approach will be "1.3". A further explanation is given below.

Explanation:

As we know,

In Decibels, the change in sound volume will be:

=

Now,

According to the question,

⇒

By applying cross multiplication and putting the value of log, we get

⇒

⇒

⇒

mistakes are ok

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