9.5 Physical Enviroment (2 QUESTIONS) at ILLUMINATION

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Last updated 7:25 PM on 9/23/26
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9 Terms

1
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sounds above 115 dB

never expose to even for short duration it is not recommended

2
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ears can hear

20 hz to 20 khz

3
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moving jets noise

roughly at 140 dB

4
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ramp noise

can often exceed 90 dB

5
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ear protection rule of thumb

use them whenever normal conversation cannot be heard clearly at two metres.

6
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according to murphys law - lighting

if stores is far away and u run out of batteries u might not wanna go across the AF to get more

7
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illumination requirements

A process control room = 300 lux

corridor or walkway = 50 lux

studying an engineering drawing = 750 lux

8
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vibration affecting body

Vibration between 0.5 Hz and 20 Hz

9
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vibration affecting hand

  • between 50 Hz and 150 Hz is worst for the hand..

  • is associated with Vibratory-induced White Finger Syndrome (VWF).


  • Pneumatic tools can generate vibrations in this range.