Question

Sounds that are louder than ______ are considered by most people to be loud.

A) 50dB
B) 90dB
C) 100 dB
D) 70dB

Answer 1

Sounds that are louder than 70 dB are considered by most people to be loud.

Step-by-step explanation:

Sounds that are louder than 70 dB are considered by most people to be loud.

The loudness of a given sound is closely associated with the amplitude of the sound wave. Higher amplitudes are associated with louder sounds. Loudness is measured in terms of decibels (dB), a logarithmic unit of sound intensity. A typical conversation would correlate with 60 dB; a rock concert might check in at 120 dB.

For example, a 90 dB sound compared with a 60 dB sound is 30 dB greater, or three factors of 10 (that is, 10³ times) as intense. Another example is that if one sound is 107 as intense as another, it is 70 dB higher.

Answer 2

A

Step-by-step explanation:

If the noise exceeds 50 decibels, the human nervous system will be affected if you stay in this environment for a long time. For every 3 decibels increase in noise on average, the noise energy will double. Noise pollution is so serious that it can even damage the human hearing system. Often exposed to noise, symptoms such as memory loss and insomnia may occur.