Concept explainers
The nearest star beyond the sun is Alpha Centauri, which is
To show that the radio signal would be sent 4.4 years ago to Alpha Centauri star, to receive the radio message today on to the Earth.
Answer to Problem 55A
The radio message would be sent 4.4 years ago.
Explanation of Solution
Given data:
Distance (d ) = 4.2 ×1016m.
We know that,
Speed of light(c )=3×108m/s.
Formula used:
Calculation:
We know that the time required,
Substitute the values of distance(d ) and velocity of light(c ) in the above formula,
= 140000000 s.
Converting the seconds in to the years,
= 4.439 years = 4.4 years.
Conclusion:
It’s shown that the radio message would be sent to Alpha Centauri 4.4 years ago.
Chapter 27 Solutions
Conceptual Physics: The High School Physics Program
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