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A particularly talkative extraterrestrial (El') civilization lives on a planet that orbits a star at a distance of 1.542 x 1014 km from Earth. Imagine they send out a radio signal tuned to a frequency of 1.5 x 108 Hz that is detected at the 305-m Arecibo radio telescope in Puerto Rico (an aerial view is shown below). The signal has a measured flux of 7 x 10-23 watts/m2. Showing all your calculations, have a go at the following action items:
What is the wavelength of ET's signal?
How long did it take the signal to reach the Earth?
How much energy is associated with the EM waves in ET's signal? Hint: think Max Plank and use h = 6.626 x 10-34 JS.
What is the luminosity of ET's signal, and how does it compare with the Sun's luminosity (hint: divide your answer for the luminosity by L? = 3.85 x 1026 Watts)?
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17) Zuckerman and others suggest that the need for sensation-seeking behaviorA) may be partly biologicalB) is entirely due to our life circumstances, especially our field of employment; if the jobis boring, we seek sensations elsewhere
Summarize Levinson's psychosocial theory of adult personality development, including how it applies to both men's and women's lives and their limitations.
Biology Gene Technology
Describe the fundamental differences and similarities between temperature and heat.
No one gets through life alone. To some extent, we are all products of our environments. We learn from our families, schools, and cultures. Every person has to face severe challenges and conquer obstacles. How we face our challenges depends on how we..
1. Compare and contrast the methods of measuring aerodynamic forces in a wind tunnel to that of an airplane in flight.
The process of confirming federal judicial appointments has become especially contentious over the past few decades. Do you think this is a result of the expanded role that courts play in political decisions, a change in the nature of contemporary po..
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