Hearing is expressed in decibels (dB), or units of loudness. ...

[ap345]

Hearing is expressed in decibels (dB), or units of loudness. Which is the softest sound a normal ear can hear?
 
  a. 0 dB
  b. 10 dB
  c. 40 to 50 dB
  d. 100 dB

Question 2

The nurse should suspect a hearing impairment in an infant who demonstrates which behavior?
 
  a. Absence of the Moro reflex
  b. Absence of babbling by age 7 months
  c. Lack of eye contact when being spoken to
  d. Lack of gesturing to indicate wants after age 15 months

[mfedorka]

Answer to Question 1

ANS: A
By definition, 0 dB is the softest sound the normal ear can hear. Ten dB is the sound of the heartbeat or the rustling of leaves. 40 to 50 dB is in the range of normal conversation. The noise of a train is approximately 100 dB.

Answer to Question 2

ANS: B
The absence of babbling or inflections in voice by age 7 months is an indication of hearing difficulties. The absence of the Moro reflex and eye contact when being spoken to does not indicate a hearing impairment. The child with hearing impairment uses gestures rather than vocalizations to express desires at this age.