Answer:The focal length of a lens is determined by the curve of the lens and the material that the lens is made from.
Explanation:
i just took the test
The frequency is 0.25Hz and the speed of the wave is 0.4m/s.
Wave frequency is the number of waves that pass a fixed point in a given amount of time. This equation shows how the three factors are related: Speed = Wavelength x Wave Frequency.
λ=1.6m,T=4s
f=1/T
f=1/4s
f=0.25Hz
The frequency of the wave is 0.25Hz
speed=fλ
speed=(0.25×1.6)m/s
speed=0.4m/s.
The speed of the wave is 0.4m/s.
The frequency is 0.25Hz and the speed of the wave is 0.4m/s.
To learn more about the frequency and speed of the wave refer:https://brainly.com/question/3148541
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