ENG437 2022 Week3

The range of frequencies audible to a young person is about

• 20 Hz to 15 kHz

• 20 to 15 kHz

• 250 to 5000Hz

• the same as a dog

A sound level meter measures

• sound pressure

• sound power

• sound intensity

• sound volume

Two sounds with the same frequency combine to give

• an increase in intensity of 6 dB

• more or less intensity depending on the phase

• twice the intensity

Permanent hearing damage can result from exposure to a SPL greater than about 90 dB for an 8 hour period

• TRUE

• FALSE

The effect of noise on a person's amenity can be minimised by

• limiting the time of day of the noise emission

• reducing the level of the noise emission

• installing effective noise barriers

• all of these

Acoustic tiles are NOT

• effective in reducing sound transmission

• used to modify the 'acoustics' of a room

• made of light porous material

The MASS LAW for acoustic materials states that the reduction in sound transmission is a function of a partition's mass/unit area

• TRUE

• FALSE

Sound intensity at a distance from a source is a function of

• the square of the distance

• air absorption

• attenuation due to barriers and trees

• all of these

Extreme opposition to a planned development if the predicted noise level at the nearest boundary

• is 25 dbA or more in excess of the acceptable noise level

• is in excess of 90 dbA

• has distinctive tonal components and bumps

• is intermitent

The dbA filter is used

• with a Sound Level Meter to give a measure of loudness

• with a Sound Level Meter for all environmental noise measurement

• to assess the likelihood of hearing damage