PSYC 230 UIUC EXAM 2 NEWEST 2026 NEWEST 2026 200 QUESTIONS AND CORRECT DETAILED ANSWERS

PSYC 230 UIUC EXAM 2 NEWEST 2026 NEWEST 2026 200 QUESTIONS AND CORRECT DETAILED ANSWERS ( ANSWERS)

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PSYC 230 UIUC EXAM 2 NEWEST 2026 NEWEST

2026 200 QUESTIONS AND

CORRECT DETAILED ANSWERS (

ANSWERS)

What is sound? - ANSWER- sound is a vibration that happens in

a medium

What is a sound stimulus? - ANSWER- periodic variations in air

pressure traveling out from the source and reaching the ears

What is a sound wave? - ANSWER- wave of pressure changes

that occur in the air as a function of the vibration of a source

Is a medium necessary to conduct sound? - ANSWER- Yes, the

sound travels through the medium to the ears

True or false: water and air are examples of mediums -

ANSWER- True, they are mediums

How fast does sounds travel? - ANSWER- 761.2 mph

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True or false: the closer or tighter the molecules are to each

other, the faster they will travel the vibration. - ANSWER- True

What are the two pressures of sound in a sound wave called? -

ANSWER- compression (high pressure) and rarefaction (low

pressure)

What is frequency measured in? - ANSWER- cycles per second

(Hz)

What is frequency? - ANSWER- the amount of time between

one peak of high pressure and the next

What are pure tones? - ANSWER- sound waves in which air

pressure changes follow a sine wave pattern and vibrate at one

frequency

What is amplitude of a sound wave? - ANSWER- the different

between the maximum sound and minimum sounds pressures

True or false: Amplitude translated to loudness - ANSWERTrue, we hear a wide range of amplitudes

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True or false: people can discriminate between differences in

loudness very well. - ANSWER- Yes, at differences as low as 1

dB.

What are changes in pressure called for sound? - ANSWERacoustic pressure

True or false: Frequency impacts how fast and far a sound

travels - ANSWER- True, lower frequency sounds travel farther

because they require less energy to keep traveling through a

medium

What is pitch? - ANSWER- pitch is the subjective experience of

frequency

What is used to measure sound amplitude? - ANSWER- Hertz

What is the relationship between amplitude and sound level? -

ANSWER- larger amplitude = louder sound

What is the relationship between frequency and pitch? -

ANSWER- the greater the frequency = higher pitch

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What is the hearing range of humans? - ANSWER- 20-20,000

Hz

Why might older people not be able to hear the full range of

sounds? - ANSWER- hearing dissipates with age, exposure to

loud sounds when young

True or false: the lowest frequencies of sound that a person can

hear tend to remain stable with age. - ANSWER- true

True or false: below 20 Hz and above 20,000 Hz, human can

hear - ANSWER- false, humans are simply deaf regardless of

amplitude at these levels of sound

What is the outer ear? - ANSWER- the par too the ear that is

visible to the outside environment

What is the pinna? - ANSWER- the lobe or part that is visible

What does the pinna do? - ANSWER- collects sound and

funnels it into the auditory canal

What is the external auditory canal? - ANSWER- ear canal;

where earwax accumulates