HITT Questions

1
HITT Questions

• Chapter 14

2

• You are walking down the street with earphones
  playing at 80 dB. A semi-truck passes by,
  temporarily raising the outside noise level to 85
  dB. What is the total sound level you hear? (the
  reference intensity Io 1 x 10-12 W/m2
• (a) 86.2 dB
• (b) 165 dB
• (c) 82.5 dB
• (d) Not enough information

3

• A police car travels towards a stationary
  observer at a constant speed, causing his 440 Hz
  siren to Doppler shift up by 15 Hz. How fast is
  the police car moving? (Speed of sound is 343
  m/s)?
• (a) 16.7 m/s
• (b) 8.6 m/s
• (c) 14.3 m/s
• (d) 11.3 m/s