Chemistry, 01.09.2020 22:01 SweetBriar
The red star in the right top portion of this picture is Betelgeuse, one of the most prominent stars in the constellation Orion. You can easily see this constellation during winter in the northern hemisphere. Betelgeuse is a red supergiant star which is ~ 634 light years from Earth. To measure the surface temperature of stars astronomers use Wien's law which relates the maximum wavelength of light emitted to the temperature. Mathematically Wien's law is written {\lambda}_{max}T = 0.2898 cm K. Betelgeuse has a {\lambda}_{max} of 8072 Å where 1 Å = 1 x 10^{−8} cm. What is Betelgeuse's surface temperature, in K? [Image description: The picture is of the night sky. Thousands of stars are shining. Some are red, some white and some blue.]
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Chemistry, 22.06.2019 05:00
In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?
Answers: 1
Chemistry, 23.06.2019 00:30
Five different substances are given to you to be dissolved in water. which substances are most likely to undergo dissolution in water? check all that apply. view available hint(s) check all that apply. sodium fluoride, naf octane, c8h18 propanol, ch3ch2ch2oh potassium iodide, ki benzene, c6h6
Answers: 1
The red star in the right top portion of this picture is Betelgeuse, one of the most prominent stars...
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