Concept explainers
(a)
The speed of earth in its orbit.
Answer to Problem 26Q
The speed of earth in its axis is
Explanation of Solution
Given:
The radius of Earth orbit is,
Formula Used:
The expression of speed of earth in its axis is given by,
Calculation:
The speed of earth in its axis is calculated as,
Conclusion:
The speed of earth in its axis is
(b)
The wavelength of transmission which Earth receives.
Answer to Problem 26Q
The wavelength of transmission which Earth receives is
Explanation of Solution
Given:
The frequency is
Formula Used:
The expression of wavelength is given by,
Calculation:
The wavelength is calculated as,
Conclusion:
The wavelength of transmission which Earth receives is
(c)
The shift in wavelength using Doppler Effect.
Answer to Problem 26Q
The shift in wavelength is
Explanation of Solution
Formula Used:
The expression of shift in wavelength is given by,
The expression of percent shift in wavelength is given by,
Calculation:
The shift in wavelength is calculated as,
The percent shift in wavelength is calculated as,
Conclusion:
The shift in wavelength is
(d)
The importance that SETI radio receivers be able to measure frequency and wavelength to very high precision.
Explanation of Solution
Introduction:
SETI pioneer Bernard Oliver was the first one who draws attention to a range of relatively noise-free frequency in the neighbor-hood of the microwave emission lines of hydrogen and hydroxide.
It is essential to track all the frequency and wavelength sent by civilization in another planetary system. So, there is a requirement of high precision technology to detect that frequency to communicate with them.
Conclusion:
Therefore, there is a requirement of a high precision radio receiver which able to measure frequency and wavelength.
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Chapter 27 Solutions
Universe: Stars And Galaxies
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