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20Q: A Shot of Prevention - Hearing Loss from Recreational Firearm Noise

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1.  Which of the following firearms has a peak SPL of less than 140 dB? .22 caliber rifles shotguns air rifles starter pistols (blanks)

2.  An example of a shooting activity that may involve recreational firearms is: hunting historical re-enactment target shooting event all of the above

3.  According to the data in the article, the upper limit of the range of mean unweighted peak SPL in dB from recreational firearms is: 174 140 135 100

4.  Peak SPL at the ear from a firearm is affected by: distance of muzzle to ear length of the barrel both A and B none of the above

5.  Conventional sound level meters: underestimate the peak SPL of firearms overestimate the peak SPL of firearms accurately estimate the peak SPL of firearms should be used by audiologists to record unweighted peak sound pressure levels from firearms

6.  Which of the following statements is true, according to the data presented in the article? shooters are at risk for hearing loss, but bystanders are not at risk. youth are not at risk for hearing loss from firearms. while the noise from typical hunting firearms may cause hearing loss, most hunters wear effective hearing protection devices. youth are more at risk for hearing loss from high impulse noise levels, and 62% of youth report never wearing hearing protection while hunting.

7.  This article cites recent data showing firearm use is associated with: increased prevalence of bilateral, speech frequency hearing impairment, and increased prevalence of bilateral high-frequency hearing impairment decreased prevalence of bilateral, speech frequency hearing impairment hearing loss only for those shooting more than 1000 rounds in a lifetime hearing loss only for those shooting high caliber rifles

8.  The risk of hearing loss from recreational firearm use can be reduced by: taking fewer shots and increasing distance between individuals in groups using a pistol with a shorter barrel shooting from a table or bench all of the above

9.  Two categories of hearing protection designed to protect against impulse sound and still allow audibility are: foam plugs and ear cones electronic hearing protectors and filtered passive protectors Weiner filters and spectral subtractors ear muffs and canal stoppers

10.  Electronic protectors provide attenuation for high level impulses (>150 dB peak SPL) by: using peak clipping to clip the sound to a safe level using compression to clip the sound to a safe level using impulse noise reduction circuitry to reduce the sound to a safe level using passive protection (i.e. the attenuation of the device with the electronics turned off)