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[Phys-L] sound frequency in helium



Dear experts, pleasse help me out with this issue of sound pitch in h=
elium=20
gas.
When one breath helium gas, and speak, it is found that the pitch inc=
reases.=20
How do we explain this? But if we compare the water wave travelling t=
hrough=20
deep to shallow water, its speed changes without frequency chage, as =
the=20
source (motor frequncy) is the same.
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