A water drop of radius 10m is broken into 1000 equal droplets. Calculate the gain in surface energy. Surface tension of water is 0075 NAm.
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- How much heat does it take to vaporize 800 g of liquid nitrogen (N 2)?The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).If a mercury thermometer is immersed in hot liquid, the mercury level goes down at first and then goes up. Explain why this happens.