[tex]\tt{\huge{\red{Solutions:}}}[/tex]
1)
v = λf
v = (4 m)(11 Hz)
v = (4 m)(11 s⁻¹)
[tex]\boxed{v = \text{44 m/s}}[/tex]
2)
[tex]f = \dfrac{v}{\lambda}[/tex]
[tex]f = \dfrac{\text{50 m/s}}{\text{0.7 m}}[/tex]
f = 71.43 s⁻¹
[tex]\boxed{f = \text{71.43 Hz}}[/tex]
3)
[tex]f = \dfrac{v}{\lambda}[/tex]
[tex]f = \dfrac{\text{250 m/s}}{\text{2.3 m}}[/tex]
f = 108.70 s⁻¹
[tex]\boxed{f = \text{108.70 Hz}}[/tex]
[tex]\\[/tex]
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