Sensitivity and frequency response (AQA A-Level Physics): Quizzes

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Sensitivity and frequency response
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What is the unit for sound intensity?

W m−2\text{W m}^{-2}

What is the threshold of hearing at 1 kHz?

1×10−121 \times 10^{-12} W m−2^{-2}

What is the threshold of pain for sound intensity?

11 W m−2^{-2}

How does sound intensity change with distance from a point source?

Follows inverse square law

What does a 10 dB increase represent in terms of intensity?

Tenfold increase

What formula calculates relative intensity level in decibels?

10log⁡10(I/I0)10 \log_{10}(I/I_0)

What sound level corresponds to normal conversation?

60 dB

At what frequency range is the human ear most sensitive?

2 kHz to 5 kHz

What is the purpose of the A-weighting filter (dBA)?

Replicate human hearing sensitivity

A sound has intensity I=10−10I = 10^{-10} W m−2^{-2}. What is its dB level?

20 dB

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