If we had sent a radio signal to an advanced civilization in 2006 which is located in the zeta reticuli star system approximately 39 light-years away and the signal was immediately replied to, when would the reply arrive back at Earth?
A) 2084
B) 2012
C) 2045
D) 2039
A
You might also like to view...
What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 nm = 10?9 m, and 1 eV = 1.6 × 10^?19 J)
a. 308 nm b. 578 nm c. 223 nm d. 156 nm e. 475 nm
If 
= 6.0, 
= 5.0, and ? = 40°, determine the scalar product of the two vectors shown.
?
?
A. +19
B. +23
C. ?19
D. ?23
E. +30
The value of an object's acceleration may be characterized in equivalent words by which of the following?
a. displacement c. velocity b. rate of change of displacement d. rate of change of velocity
Gaps in the asteroid belt (often called Kirkwood gaps) are caused by
A) orbital resonances with Jupiter. B) tidal forces from the Sun. C) tidal forces from Jupiter. D) the competing gravitational tugs of Mars and Jupiter.