1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
λ = s / f = (320 m/s) / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.
The average speed is a scalar quantity. The average speed of the skier is 10 km/hrs.
<h3>
What is the average speed?</h3>
It is calculated by dividing the total distance by the total time elapsed.
The

Where,
= average velocity
= displacement = 7.5 km
= change in time = 45 min = 0.75 hours
Put the values in the formula,

Therefore, the average speed of the skier is 10 km/hrs.
Learn more about average speed:
https://brainly.in/question/32459982
Answer and work is shown in the image attached.
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Pangaea refers to All Land
False because bases turn red litmus paper to blue and acids turn blue litmus paper red