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Please sit together in pairs: Mike A. and Da Barney and Heran Thomas and Joe Serruto

Mikhail and Matt R. Valerie and Grant Kevin and Evan Ally and Rebecca Matt M. and Katherine Morgan and Joe Sebek Laura and Quanbiao Lauren and Charlie Mikey O. and Lu Hannah and Ashkan Jim and Naichen Nick and Dale Ben and Disha Nik and Efrain. Please sit together

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Please sit together in pairs: Mike A. and Da Barney and Heran Thomas and Joe Serruto

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  1. Mikhail and Matt R. • Valerie and Grant • Kevin and Evan • Ally and Rebecca • Matt M. and Katherine • Morgan and Joe Sebek • Laura and Quanbiao • Lauren and Charlie • Mikey O. and Lu • Hannah and Ashkan • Jim and Naichen • Nick and Dale • Ben and Disha • Nik and Efrain • Please sit together in pairs: • Mike A. and Da • Barney and Heran • Thomas and Joe Serruto • Glenn and Yiran • Ann and Steve T. • Johnny and Joey B. • Korey and Andrea • Will and Stephen H. • Michael W. and Qihan • Zach and Nicole • Casey and Ed • Audrey and Zhenmin • Lisette and Taehoon • Erica and Shenheng Phys 150 Lecture 19

  2. Announcements • Homework 9 is due on Monday, Nov. 5 at midnight. • Quiz on Chapter 10 on Tuesday, Nov. 6 Phys 150 Lecture 19

  3. Electromagnetic spectrum Phys 150 Lecture 19

  4. i>clicker question Microwaves are used for • heating water • communications • radar • All of the above Phys 150 Lecture 19

  5. i>clicker question Microwaves are used for • heating water – microwave oven • communications – cell phones, wireless • radar – get velocity from doppler shift • All of the above Microwave oven Microwave oven Phys 150 Lecture 19

  6. i>clicker question Microwaves are used for • heating water • communications • radar • All of the above IR radiation = 1 μm – 1 mm Microwaves = 1 mm – 1 m Radio waves = 1 m and beyond Phys 150 Lecture 19

  7. i>clicker question This device is used for • missle guidance • radar tracking • communications • crowd control Phys 150 Lecture 19

  8. i>clicker question This device is used for • missle guidance • radar tracking • communications • crowd control - Active Denial System (ADS) • Microwaves (3 mm) heat water in skin • Has never been used Phys 150 Lecture 19

  9. i>clicker question Calculate the wavelength of WILL FM 90.9 radio (90.9 MHz) • 3 m • 30 m • 300 m • 3000 m c = 3 x 108 m/sec Phys 150 Lecture 19

  10. i>clicker question Calculate the wavelength of WILL FM 90.9 radio (90.9 MHz) • 3 m • 30 m • 300 m • 3000 m c = 3 x 108 m/sec L = c/f = (3 x 108 m/sec) / (90.9 x 106/sec) ≈ 3 m Phys 150 Lecture 19

  11. i>clicker question Calculate the wavelength of WILL AM 580 radio (580 kHz) • 5 m • 50 m • 500 m • 5000 m Phys 150 Lecture 19

  12. i>clicker question Calculate the wavelength of WILL AM 580 radio (580 kHz) • 5 m • 50 m • 500 m • 5000 m c = 3 x 108 m/sec L = c/f = (3 x 108 m/sec) / (580 x 103/sec) ≈ 500 m Phys 150 Lecture 19

  13. i>clicker question This airport full-body scanner uses • microwaves • radio waves • ultraviolet radiation • infrared radiation Phys 150 Lecture 19

  14. i>clicker question This airport full-body scanner uses • microwaves • radio waves • ultraviolet radiation • infrared radiation • Millimeter wave scanner • Uses reflected microwaves Phys 150 Lecture 19

  15. i>clicker question X rays (choose the INCORRECT answer) • are preferentially absorbed by light elements • can be reflected • can cause cancer • are used in CT scans Phys 150 Lecture 19

  16. i>clicker question X rays (choose the INCORRECT answer) • are preferentially absorbed by light elements - Absorbed by heavy elements • can be reflected – X ray backscatter • can cause cancer – depends on dose (Sieverts) • are used in CT scans – CAT scans Phys 150 Lecture 19

  17. i>clicker question X rays (choose the INCORRECT answer) • are preferentially absorbed by light elements - Absorbed by heavy elements • can be reflected – X ray backscatter • can cause cancer – depends on dose (Sieverts) • are used in CT scans – CAT scans X ray backscatter at O’Hare Phys 150 Lecture 19

  18. i>clicker question X rays (choose the INCORRECT answer) • are preferentially absorbed by light elements - Absorbed by heavy elements • can be reflected – X ray backscatter • can cause cancer – depends on dose (Sieverts) • are used in CT scans – CAT scans Phys 150 Lecture 19

  19. i>clicker question MRI uses • microwaves • radio waves • X rays • infrared radiation Phys 150 Lecture 19

  20. i>clicker question MRI (Magnetic Resonance Imaging) uses • microwaves • radio waves– and a strong magnetic field • X rays • infrared radiation Magnetic field Phys 150 Lecture 19

  21. i>clicker question A PET scan • is a type of CAT scan • uses X rays • uses gamma rays • uses ultrasound Phys 150 Lecture 19

  22. i>clicker question A PET scan (Positron Emission Tomography) • is a type of CAT scan – Computed Tomography • uses X rays – CT scan • uses gamma rays– positrons annihilate electrons to produce gamma rays • uses ultrasound – mm wavelength sound Phys 150 Lecture 19

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