a-105 study guide 1

# 21 list the types of electromagnetic radiation in

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21. List the types of electromagnetic radiation in order of increasing wavelength. 22. For photons 1 and 2, if λ 1 2 = 5 , find the ratios ν 1 2 and E 1 /E 2 . 23. Consider an ultraviolet photon with wavelength λ UV = 300 nm and an infrared photon with wavelength λ IR = 1200 nm . Compute the ratios ν UV IR and E UV /E IR . 24. Explain how the Kelvin (absolute) temperature scale is defined. Give the temperatures for the following in the Fahrenheit, Celsius, and Kelvin scales: (a) absolute zero (b) the freezing point of water (c) the boiling point of water 25. Explain what black body radiation is. 26. Sketch approximate black body curves (spectra) for stars with temperatures of 3000 K, 6000 K, and 12,000 K. Label the axes. Indicate the wavelengths of peak emission on your figure. On which side of the peak do the curves fall faster? 27. For two stars with the following surface temperatures, calculate the ratio of wavelengths of peak emission, λ max , 1 max , 2 . T 1 = 3000 K , T 2 = 12 , 000 K 28. The wavelength of peak emission of the Sun is approximately 500 nm and the surface temperature of the sun is approximately 6000 K. Use this information to find the wavelength of peak emission for a star that has a surface temperature of 3000 K.

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