d) Which telescope, optical or X-ray, would have higher resolving power for the same aperture? Calculate the magnitude of the faintest object that a 15 m optical telescope can detect.
### (d) Resolving Power of Optical vs. X-ray Telescopes The resolving power (\(\theta\)) of a telescope is given by the Rayleigh criterion: \[ \theta = \frac{1.22 \lambda}{D} \] where: - \( \lambda \) = wavelength of light, - \( D \) = aperture of the telescope. #### Comparison of Optical and X-ray Telescopes - Optical telescopes operate _____ _____ ____ __________ ____.
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c) Show the horizon coordinates of a star X on a celestial sphere for a location at latitude N.
b) With the help of a diagram, explain the unified scheme for understanding active galactic nuclei.
c) What is cosmic background radiation? Explain why it is so important to the debate between evolving and a steady-state universe.
e) The local time at Chennai is 9 p.m. Calculate the local time at Mumbai at that time.
d) Describe the composition of the interstellar medium. Explain how it has been possible to map the HI clouds.
d) Which telescope, optical or X-ray, would have higher resolving power for the same aperture? Calculate the magnitude of the faintest object that a 15 m optical telescope can detect.
b) Explain how sunspots survive for so long even though they are surrounded by hotter matter