To find the velocity of the wave using the equation \( v = f \times \lambda \), where:
- \( v \) is the velocity,
- \( f \) is the frequency,
- \( \lambda \) is the wavelength.
Given:
- Frequency \( f = 3,500 , \text{Hz} \)
- Wavelength \( \lambda = 15.0 , \text{m} \)
Now, substitute the values into the equation:
\[ v = 3,500 , \text{Hz} \times 15.0 , \text{m} \]
\[ v = 52,500 , \text{m/s} \]
So, the velocity of the wave is 52,500 m/s. Therefore, the correct answer is 52,500 m/s.