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# Physics Question watch

1. I need help with 4b
Attachment 728830
2. no attachment

3. Oh sorry. 4b --> How would I describe the spectrum when the sound is quieter
4. (Original post by joyoustele)

Oh sorry. 4b --> How would I describe the spectrum when the sound is quieter
On that type of graph amplitude is on the y axis and frequency is on the x axis.

quieter means a reduction of amplitude.

seems quite simple tbh - how many marks is it for?
5. (Original post by joyoustele)

Oh sorry. 4b --> How would I describe the spectrum when the sound is quieter
Associate the p.d. with the amplitude of the sound.
So quieter means that the p.d. at all frequencies is lower.
The frequencies where the peaks in the spectrum occur are unchanged.
6. (Original post by Joinedup)
On that type of graph amplitude is on the y axis and frequency is on the x axis.

quieter means a reduction of amplitude.

seems quite simple tbh - how many marks is it for?
2 marks, that would only get 1 mark
7. (Original post by Eimmanuel)
Associate the p.d. with the amplitude of the sound.
So quieter means that the p.d. at all frequencies is lower.
The frequencies where the peaks in the spectrum occur are unchanged.
I got the first bit, but I dont really understand the 2nd point. "Peaks at same frequency"
8. (Original post by joyoustele)
I got the first bit, but I dont really understand the 2nd point. "Peaks at same frequency"
If you look at the spectrum, there are several peaks at different frequencies. Say at about 80Hz, there is a peak. The peak would not change when the sound is quieter but the p.d. at 80 Hz would be lower.
9. (Original post by Eimmanuel)
If you look at the spectrum, there are several peaks at different frequencies. Say at about 80Hz, there is a peak. The peak would not change when the sound is quieter but the p.d. at 80 Hz would be lower.
ohhhhhhhhhh, Alright, thanks a lot

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