Help me in a quiz this is last Q!

See below

Explanation:

Part a)

Frequency = No. of vibrations / Time

For Drum A:

No. of vibrations = 450 times

Time = 10 seconds

Drum A = 450 / 10

Frequency of Drum A = 45 Hz

For Drum B:

No. of vibrations = 700 times

Time = 20 secs

Frequency of Drum B = 700 / 20

Frequency of Drum B = 35 Hz

Part b:

Since frequency is directly proportional to the pitch. Hence, the drum with higher frequency will have a higher pitch. So, Drum A produces notes with higher pitches.

Hope this helped!

the objects have the same charge.