Problem 42 - A Complete Resource Book in Chemistry for JEE Main

Question

Human ear can tolerate noise upto (a) 100 decible (b) 80 decible (c) 60 decible (d) 40 decible

Step-by-Step Solution

Answer

(a) 100 decibels

Step 1: Understanding Decibels and Human Hearing

The decibel (dB) is a unit used to measure the intensity of sound. The human ear can tolerate a range of sounds safely without damage, usually up to a certain decibel level.

Step 2: Identifying the Safe Limit for Human Ears

Based on common scientific understanding, the human ear can generally tolerate sound levels up to around 85 to 100 decibels before it starts risking damage from prolonged exposure.

Step 3: Evaluating the Options

Reviewing the options given, we need to identify the highest decibel level that is considered safe for the human ear. The answers provided are 100 dB, 80 dB, 60 dB, and 40 dB.

Step 4: Selecting the Correct Answer

Among the options, 100 dB appears to be the upper limit of acceptable levels for the human ear, assuming temporary exposure. Therefore, the correct answer that aligns with general safety limits for short-term exposure is 100 decibels.

Key Concepts

Understanding Decibel Measurement

Decibels, abbreviated as dB, are used to measure the intensity of sound. This unit is logarithmic, which means it does not increase linearly like a typical numerical scale. Instead, each 10 dB increase represents a tenfold increase in intensity. This peculiar scale helps accurately convey the vast range of sounds humans can hear.

• A whisper is about 30 dB.
• Normal conversation ranges around 60 dB.
• A lawnmower measures approximately 90 dB.

As the decibel level increases, so does the risk of hearing damage, especially with prolonged exposure. Understanding decibels is crucial in assessing how loud an environment or activity is and taking steps to protect your hearing accordingly.

Human Ear Sound Limits

Our ears have limits to the amount of sound they can handle before we start to experience discomfort or, worse, permanent damage. Usually, the human ear can safely endure sounds up to 85 decibels for extended periods without significant risk of harm. However, once levels exceed 85 dB, the potential for damage begins to climb.
Sounds above 100 dB are usually only tolerable for brief durations without hearing protection. Concerts, sirens, and construction noise often fall into this higher-risk category, emphasizing the need for awareness and protective measures in noisy environments.

Safe Sound Exposure Levels

Maintaining safe exposure levels to sound is critical to protecting your hearing health over time. While sounds at or below 70 dB are generally deemed safe for any duration, caution is advised as levels approach or exceed 85 dB. To keep your hearing intact:

• Limit exposure time in loud environments.
• Use ear protection like plugs or earmuffs in high-noise settings.
• Take regular breaks from loud sounds to give your ears a rest.

Awareness of these safe levels allows you to partake in noisy activities responsibly, minimizing the chance of long-term hearing loss.