Noise pollution

Question 1

2 effects of noise on non living objects

Answer 1

-Acoustic fatigue , stress cracking
-Shock impacts , sudden very loud noise , sonic boom , structural damage

Question 2

2 effects of noise on living objects

Answer 2

-hearing damage
-behavioural damages

Question 3

1 Aircraft engine controls

Answer 3

-Hush kits work like chevron nozzles and are fitted to low bypass ratio engines to make them quieter

Question 4

2 aircraft body design

Answer 4

-Lighter aircraft can do this by using materials such as carbon fibre , requires less engine thrust to take off
-Blended wing aircraft , engines can be located on top of aircraft so body can act as a barrier reducing noise that reaches the ground

Question 5

2 controls of noisier aircraft

Answer 5

-Charges/fines
-restricted flight times

Question 5

2 Aircraft operation

Answer 5

-Flight path , avoid densely populated areas
-Night flight restrictions , especially take offs

Question 6

1 way of controlling railway , road traffic , industrial and domestic noise

Answer 6

-Railway=Composite material brakes reduces squeak
-Road traffic= improved vehicle aerodynamics makes less vehicle air turbulence
-Industrial , acoustic surveys to detect cetaceans , this allows cetaceans to leave or noise activity to be delayed
-Domestic= Wear ear defenders when using power tools

Question 7

1 way of measuring road traffic noise and aircraft noise

Answer 7

-Road=LA 10 measures noise exceeded for 10% GOOD AT MEASURING noisiest periods
-Aircraft=Leq 57DB , average sound level over a particular period