Created by StemPy LabThree constants of nature are Planck's constant , the speed of light and the gravitational constant . They can be combined into a quantity with the dimensions of length, called the Planck length. Which combination has the dimensions of length?
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← A proton is accelerated from rest through a potential difference of 1 V. An electron is accelerated from rest through a potential difference V, chosen so that it has the same de Broglie wavelength as the proton. The mass of a proton is 1836 times the mass of an electron. Ignoring relativity, the value of V, in volts, is ____.A man walks at 3 km/h on level ground, and to him the rain seems to fall vertically. When he doubles his walking speed in the same direction, the rain seems to come at 45° to the vertical, towards his face. The actual velocity of the rain is →
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