WorksheetsFundamentals of Environmental Noise
Total questions: 10
Worksheet time: 5mins
What is the audible frequency range for humans?
100 Hz to 10,000 Hz
20,000 Hz to 40,000 Hz
20 Hz to 20,000 Hz
0 Hz to 20 Hz
What is the speed of sound in water?
1000 m/s
5000 m/s
1500 m/s
340 m/s
What does the decibel scale measure?
Frequency of sound
Velocity of sound
Pressure variations in sound
Temperature of sound
What is the threshold of hearing in decibels?
0 dB
20 dB
60 dB
130 dB
What happens when sound waves encounter an obstacle?
They disappear
They reflect
They amplify
They change frequency
What is a standing wave?
A wave that travels in one direction
A wave that does not move
A wave formed by the interference of two waves
A wave that only exists in fluids
What is the primary cause of refraction in sound waves?
Change in temperature
Change in frequency
Change in medium density
Change in amplitude
What is the effect of temperature on sound propagation?
It increases sound speed in warm air
It decreases sound speed in warm air
It increases sound speed in cold air
It has no effect
What is the characteristic impedance of a medium?
The frequency of sound in the medium
The ratio of acoustic pressure to particle velocity
The density of the medium
The speed of sound in the medium
What type of noise source is an engine classified as?
Environmental noise
Mechanical noise
Acoustic noise
Vibrational noise
