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Unformatted text preview: passes Alpha Centauri he sends a radio
message back to Earth and continues traveling away from Earth. The
Earthlings reply immediately. How long must Schmedrick wait for his
reply? Solution on next slide Space Travel & The Speed of Light (cont.)
Answer: Since we know a trip back and forth from Alpha
Centauri takes a total of 8.6 years, we can set up our
equation in the following way:
d = vt (c = 1 in light years per year)
8.6 + v t = c t
⇒ 8.6 + 0.03 c t = c t
⇒ 8.6 + 0.03 t = t
⇒ 8.6 = 0.97 t
⇒ 8.6 / 0.97 = 8.87 A. C. S. 4.3 ly v t Schmedrick will have to wait 8.87 years to get a reply back
Links: Find out more about Alpha Centauri here. Why Objects Have Color
Visible light is a combination of many wavelengths (colors), which
give it a white appearance. When light hits an object certain
wavelengths are reflected and others are absorbed. The reflected
wavelengths are the ones we see and determine the color of an
object. In the first picture the tomato absorbs blue and green wavel...
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This note was uploaded on 11/17/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.
- Fall '11