Please answer both parts A and B. The question is in the link. Thank you! http:/

Question

Please answer both parts A and B. The question is in the link. Thank you!

http://i.imgur.com/XeuiTIV.png

Baseball scouts often use a radar gun to measure the speed of a pitch. One particular model of radar gun emits a microwave signal at a frequency of 11.107 GHz. What will be the increase in frequency if these waves are reflected from a 88.0 mi/h fastball headed straight toward the gun? (Note: 1 mi/h = 0.447 m/s) Hz A cell phone transmits at a frequency of 1.29 times 10^8 Hz. What is the wavelength of the electromagnetic wave used by this phone? m

Explanation / Answer

a)

v = 88 mi/h = 39.336 m/s

c=300000000 m/s

1 GHz= 109 Hz

fr = 11.107 GHz (c/(c-39.336)) = 1.0000001311200171924566542749165*11.107 GHz = 11107001456 Hz

b)

wavelength = v/f = 3*108/1.29*108 = 2.3256 m

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