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Which of the following sounds has the highest frequency?

a. a computer battery
b. an air conditioning unit
c. a water heater
d. an electrical outlet​

2 Answers

6 votes
The answer should be D
answered
User Jevaun
by
8.7k points
5 votes

Answer:

d

Step-by-step explanation:

answered
User Maite
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7.9k points