Answer: It would have a high pitch.
Explanation: since the whistle has a high frequency, I can infer that it will have a high pitch.
Answer:


Explanation:
Hello,
In this case, for the natural occurring isotopes we equal the average atomic mass via:

Thus, since both percentages of abundance must turn out 100%, we can write:

So we can write:

Solving for the percentage of abundance of Rb-87:

Therefore, the percentage of abundance of Rb-85 turns out:

Best regards.
D)They are metals.
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