9: Explain the radar cross section.
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A: Given data: Wavelength, λ=550 nm=550×10-9m
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A: Given data: A radio wave Frequency (f) = 920 kHz Required: The wavelength (λ)
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A: Ozone in Earth's upper atomosphere is most helpful in absorbing potentially damaging ultraviolet…
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Q: Long distance radio broadcasts use short-wave bands. Why?
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- 15.) Because gamma rays have the highest frequency and carry the most energy, a. they are sometimes used to kill cancer cells b. they are widely used for communication over long distances c. they are very valuable for thermal imagingPredict the effect on human life if the ozone layer, which blocks harmful ultraviolet waves, becomes thinner or develops more holes.6. The earth's ionosphere reflects radio waves with frequencies below 5 MHz. Please estimate the plasma density in the earth's ionosphere.