A note, A from a guitar produces a wave of amplitude 4 mm and frequency 1000 Hz. Another note, B from a…

Analyze the question: Two notes are compared using amplitude and frequency. We must connect these to the properties of sound.

Concept:

• Loudness (intensity) depends on amplitude. A larger amplitude gives a louder sound.
• Pitch depends on frequency. A higher frequency gives a higher pitch.
• Quality (timbre) depends on the waveform and harmonics. Different instruments produce different quality.
• Speed of sound depends on the medium, not on the source or frequency.

Solution:

| | Note A (guitar) | Note B (whistle) | |---|---|---| | Amplitude | 4 mm | 2 mm | | Frequency | 1000 Hz | 2200 Hz |

Checking each option:

• A. A has a higher pitch than B. False. B has the higher frequency (2200 Hz > 1000 Hz), so B has the higher pitch.
• B. A is louder than B. True. A has the larger amplitude (4 mm > 2 mm), so A is louder.
• C. B has a greater speed than A. False. Both travel through air at the same speed. Also, v = fλ, and the higher frequency of B just means a shorter wavelength.
• D. B is louder than A. False. This is the reverse of the correct statement.
• E. A and B have the same quality. False. A guitar and a whistle are different instruments and produce different quality. The question says only "similar" waveform, which is not the same as identical quality.

Tip: Remember the pairs: Amplitude → Loudness, Frequency → Pitch, Waveform → Quality. Speed depends only on the medium. Match each to its property and these questions become quick.