Loud speaker A vibrates 200 times each second. Loud speaker B vibrates 400 times each second.
a)What is the frequency of the sound produced by Loud speaker A? Give the value and
unit.
b)Which loudspeaker produces higher frequency of vibrations?

A. 200 Hz

B. Speaker B.

Explanation:

We'll begin by defining the frequency.

The frequency of a wave is defined as the number of vibrations made in 1 second. Mathematically it can be represented as:

Frequency (f) = number of vibration (n) / time (t)

f = n / t

A. Determination of the frequency produced by loud speaker A.

Number of vibrations (n) = 200

Time (t) = 1 s

Frequency (f) =?

f = n / t

f = 200 / 1

f = 200 Hz

B. Determination of the loudspeaker that produces the highest frequency of vibrations.

We shall determine the frequency produced by each speaker. This is illustrated below:

For speaker A:

Number of vibrations (n) = 200

Time (t) = 1 s

Frequency (f) =?

f = n / t

f = 200 / 1

f = 200 Hz

For speaker B:

Number of vibrations (n) = 400

Time (t) = 1 s

Frequency (f) =?

f = n / t

f = 400 / 1

f = 400 Hz

SUMMARY:

Speaker >>>> Frequency

A >>>>>>>>>> 200 Hz

B >>>>>>>>>> 400 Hz

From the above illustration, speaker B produces the highest frequency of vibration.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg