Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five simplest elements, why are they rare compared to many heavier elements?
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Helium fuses into carbon by combining three helium nuclei (atomic number
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Diffraction Gratings: When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A. 138 nm B. 183 nm C. 367 nm D. 637 nm
A common 5-L metal can will float in air if it is
A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough into the air. D) Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.
Which distance measurement technique is best suited to measuring objects at a distance of 10 million light-years?
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Suppose a satellite orbits the earth so closely that it experiences some drag due to the earth’s upper atmosphere. This will drain away some of the orbital energy of this system, converting it to thermal energy. If this happens fairly slowly, the satellite’s orbit will remain nearly circular. What happens to the radius of this satellite’s orbit as time passes in this case?
A. It slowly decreases. B. It remains the same: just the satellite’s speed decreases. C. It slowly increases