Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
Loud noise can___ which can ___
|
constrict capillaries; decrease blood flow
|
|
|
High decibel levels can____ and alter ____
|
increase blood pressure ; rhythm of heart
|
|
|
Psychological effects of high noise levels include:
|
increase nervousness, loss of sleep, interference with concentration, irritability, anxiety, fright, stress reactions
|
|
|
Frequency of normal human hearing is between
|
50 – 15000 Hz.
|
|
|
Ultrasound-
|
frequencies lie above normal range
|
|
|
Infrasound-
|
frequencies lie below normal range
|
|
|
1968 amendment to federal aviation act which gave FAA the authority to
|
prescribe standards for controlling and measuring aircraft noise
|
|
|
1969 US department of labor set limits for
|
occupational noise exposure in certain companies
|
|
|
OSHA (occupational safety and health act):
|
on the job safety protection for employees in private industries
|
|
|
NCA (noise control act) authorized
|
EPA to set standards limiting noise generations and EPA coordinated federal programs related to noise control/research (effects of noise on life/property)
|
|
|
SST controversy –
|
supersonic transport plane built in France/great Britain and could fly more than twice the speed of sound. These planes created sonic booms (loud thunderclap lasting for less than a second but can cause damage to windows down below) that were continuous and trailed the plane and the power of these booms would increase as speed of plane increased.
|
