How to calculate questions about Waves

This calculation must be done in two parts. Use the time period to find the frequency then use the frequency and wavelength to find the wave speed

Time period = 1 ÷ frequency.

0.42 = 1 ÷ frequency.

frequency = 1 ÷ 0.42.

= 2.38 Hz.

wave speed = frequency × wavelength.

wave speed = 2.38 × 0.34.

= 0.809 m/s.

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the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.