已知甲乙丙皆為正立方體的金屬塊不與水反應其邊長為1 cm 2 cm 3 cm密度分別為2 g/cm3 3 g/cm3 4G/cm3放入一個水桶裝在江水注滿將3塊金屬完全淹沒折尺3塊金屬手作 的福利總和為多少gw 54
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Energy flows from the producer level to the level. is called

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.