Answer
$$105 \mathrm{Hz}
$$
Work Step by Step
The lowest possible resonant frequency is
$$
f_{1}=\Delta f=f_{n+1}-f_{n}=420 \mathrm{Hz}-315 \mathrm{Hz}=105 \mathrm{Hz}
$$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 16 - Waves-I - Problems - Page 474: 45a
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