Why do single-dish radio telescopes have poor resolving power compared to optical telescopes of the same diameter?
What will be an ideal response?
Because the size of diffraction fringes is proportional to the wavelength of light being focused, and radio waves have longer wavelengths than visible light.
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The six diagrams represent the sky at six different latitudes. Which diagram represents the paths of stars at the North Pole?
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Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 2 years B) 1 year C) 6 months D) It cannot be determined from the information given.
The rare earth element gadolinium is ferromagnetic, and it has a saturation magnetization of 20×105 A/m at low temperatures.
(a) Calculate the number of Bohr magnetons per atom of gadolinium atom, knowing that the atomic mass is 157.2 g/mole and the density is 7.89 g/cm3. (b) What is the average number of parallel unpaired electron spins in the 4f shell per gadolinium atom?
Water at 4°C will expand when it is slightly
A) cooled. B) warmed. C) both of these D) none of the above