Question

$90dB$ sound is ${}^{\prime }{x}^{\prime }$ times more intense than $40dB$ sound, then $x$ is

• A. $5$
• B. $50$
• C. ${10}^5$
• D. $500$

Answer 1

The correct option is C ${10}^5$

For every 10dB, intensity rises by 10 times, so for 50 dB intensity will rise by ${10}^5$