Survey of the Universe Tom Burbine

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Presentation transcript:

Survey of the Universe Tom Burbine tburbine@mtholyoke.edu 8/6/2018 Survey of the Universe Tom Burbine tburbine@mtholyoke.edu

Prospective Astronomy Majors Lunch Monday, March 4th 12:15-1:10pm Kendade 303 Meet the faculty, learn about the Mars Rover, and enjoy a delicious lunch.

HW# 3 Due March 6

Characteristics of waves 06/16/10 06/16/10 velocity = wavelength x frequency Wavelength = distance Frequency = cycles per second = hertz 4

For light c = wavelength x frequency 06/16/10 06/16/10 For light c = wavelength x frequency In a vacuum, speed of light stays the same So if wavelength goes up Frequency does down f = frequency λ = wavelength c = λ x f 5

Calculations c = λ x f So if the wavelength is 1 x 10-12 m 06/16/10 06/16/10 Calculations c = λ x f So if the wavelength is 1 x 10-12 m 3 x 108 m/s = 1 x 10-12 m * f f = 3 x 108 m/s/1 x 10-12 m f = 3 x 1020 s-1 = 3 x 1020 Hz 6

Calculations c = λ x f So if the frequency is 1 x 1015 Hz 06/16/10 06/16/10 Calculations c = λ x f So if the frequency is 1 x 1015 Hz 3 x 108 m/s = λ * 1 x 1015 Hz λ = 3 x 108 m/s/1 x 1015 Hz λ = 3 x 10-7 m 7

Energy of light Energy is directly proportional to the frequency 06/16/10 06/16/10 Energy of light Energy is directly proportional to the frequency E = h * f h = Planck’s constant = 6.626 x 10-34 J*s since f = c/λ Energy is inversely proportional to the wavelength E = hc/λ 8

06/16/10 06/16/10 Calculations What is the energy of a radio wave with a frequency of 1 x 107 Hz? E = h * f h = Planck’s constant = 6.626 x 10-34 J*s E = 6.626 x 10-34 J*s * 1 x 107 E = 6.626 x 10-27 J 9

06/16/10 06/16/10 Calculations What is the energy of a gamma ray photon with wavelength of 1 x 10-15 m E = hc/λ h = Planck’s constant = 6.626 x 10-34 J*s E = 6.626 x 10-34 J*s * 3 x 108 m/s / 1 x 10-15 m E = 1.99 x 10-10 J 10

06/16/10 06/16/10 11

Higher the frequency, Higher the energy of the photon 06/16/10 06/16/10 VIBGYOR violet red Higher the frequency, Higher the energy of the photon Higher the wavelength, Lower the energy of the photon 12

ROYGBIV ROYGBIV Red – long wavelength Violet – short wavelength 06/16/10 ROYGBIV ROYGBIV Red – long wavelength Violet – short wavelength

06/16/10 http://www.arpansa.gov.au/images/basics/emr.jpg

Any Questions?