4. The "seeing ability" or resolution of radiation is determined by its wavelength. If an atom is approximately 10⁻¹⁰ m in diameter, how fast must an electron travel to have a wavelength smaller than the size of an atom?

3. Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative to their own ship?

4. The "seeing ability" or resolution of radiation is determined by its wavelength. If an atom is approximately 10⁻¹⁰ m in diameter, how fast must an electron travel to have a wavelength smaller than the size of an atom?

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