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16 Cards in this Set
- Front
- Back
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1. What is the TLV for noise in CA? Can it be exceeded and how?
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a. OSHA Standards (FEDERAL)= PEL=90dB @ 8Hours
b. CAL-OSHA Standards (STATE)= PEL= 85dB @ 8Hours |
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2. At what level will noise be painful to the ear?
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a. 90dB
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3. What are the two most important criteria for noise?
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?
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4. What is a Decibel?
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a. The unit of measurement of the SPL (Sound Pressure Level).
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5. Frequency is measured in what type of scientific unit?
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a. HERTZ (Hz)
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6. What noise testing device is used for hearing test?
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a. Audio Metric Testing
i. This is the instrument that measures and test and employee that work at a noisy job to distinguish their hearing ability. |
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7. How does the inverse square law apply to sound?
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a. Technically what this law states is that, if you have source where sound is travelling from 0-50ft in distance, as you double another 50ft you begin to lose the sound. The sound begins to diminish.
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8. List the methods of effective noise control (From best to the worst)
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a. Eliminating the noise source if practically possible
b. Environmentally locating the noise source to a noise damping location. c. Shielding the device or equipment against noise d. Provide personal protection equipment for workers (Hearing protection) |
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9. Define NOISE.
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a. Unwanted sound/ nuisance
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10. Frequencies in the lower spectrum of sound (bass) usually require more power to produce sound. Why?
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a. The ear does not hear all frequencies. Only frequencies from 20 to 20,000 Hz.
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11. Explain how a sound level meter differs from a wave band generator.
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a. Sound level Meter- Measures the sound pressure (dB) of actual sound emitted from a source. FREQUENCY DOES NOT PLAY A KEY ROLE HERE
b. Wave band Generator-aka “octave waveband analyzer” Test the patient for hearing acuity. Emits different frequency sounds but SOUND PRESSURE IS NOT A VITAL KEY TO THIS DEVICE. |
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12. What are the other definitions which have a direct relation to noise?
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a. Sociocusis- became deaf from noise as you get older
b. Pressbycusis- age deafness (no noise exposure effects) |
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13. Describe the doubling effect of sound for many identical sources?
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a. You do not achieve 200dB if you have 2 speakers each with 100dB in each. It doesn’t work that way. What happens is that 100dB+100dB= 103dB. So usually you add 3dB within every doubled. If you have 4 speakers that all emit 100dB, then you get 106dB sound pressure.
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14. What are some of the detrimental effects of noise to human beings?
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a. Speech interference
i. Noise interferes with conversations. b. Physiological effects i. Hearing loss ii. Headache, fatigue, body stress c. Psychological i. Anger, irritability, fear, high blood pressure. |
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15. What is a threshold shift
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a. TTS- TEMPORARY THRESHOLD SHIFT- is when you have hearing loss but its recoverable after a period of time away from the noise, usually after several hours.
b. PTS- PERMANENT THRESHOLD SHIFT- permanent hearing loss that is seen in workers who have been exposed to noise. |
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16. Why do noise complains get registered?
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a. Noise that’s not that intense enough to cause hearing damage. But it’s enough to disrupt speech and communication in a work place. It is undesirable.
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