f the emissivity of the metal ball is 0.7, at what rate does it radiate energy? (Stefan Boltzmann constant, s= 5.67 x 10-8 W m-2 K-4) State your answer (in Watts) to the nearest whole number. d) What is the peak wavelength of the radiation emitted by the metal ball? Give your answer (in µm) to 2 decimal places. E.g. if your answer is 5.708x10-6 m give your answer as 5.71 (as this will mean 5.71 µm)
A metal ball, which has a surface area of 175 cm2, is heated in a furnace to 678 oC.
a)
State the value of temperature in the correct SI units. State your answer as a whole number (and use this value as a whole number, if needed in subsequent calculations).
b)
State the area in correct SI units. Give your answer in Scientific notation using E for x10x., e.g. you would enter 3.21x106 as 3.21E6. Make sure you have 3 significant figures in the first part of the answer and use this value to this degree of accuracy, if needed in subsequent calculations.
Note that Numbas will mark equivalent answers as correct e.g. if 3.21E6 was the correct answer then 32.1E5 or 321E4 etc. would also be marked correct.
c)
If the emissivity of the metal ball is 0.7, at what rate does it radiate energy? (Stefan Boltzmann constant, s= 5.67 x 10-8 W m-2 K-4) State your answer (in Watts) to the nearest whole number.
d)
What is the peak wavelength of the
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