Answer
The pitch decreases.
Work Step by Step
To answer the question, try it and see!
Pouring in water increases the mass of the system while the "springiness" of the glass stays the same. Its natural frequency decreases.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Think and Discuss - Page 390: 86
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