Final answer:
The velocity of an 8MHz wave in Magnesium Niobium Oxide is approximately 67,700 km/s.
Step-by-step explanation:
The velocity of a wave traveling in a material can be calculated using the formula v = c / √εr, where v is the velocity of the wave, c is the speed of light in a vacuum, and εr is the relative permittivity of the material. In this case, the relative permittivity of Magnesium Niobium Oxide is given as 21. The speed of light in a vacuum is approximately 3.00 × 10^8 m/s. Plugging these values into the formula, we get:
v = (3.00 × 10^8 m/s) / √21 ≈ 6.77 × 10^7 m/s
Converting this velocity to kilometers per second, we divide the value by 1000:
6.77 × 10^7 m/s ÷ 1000 ≈ 67,700 km/s