Why is the angular resolution of radio telescopes much worse than that of smaller optical telescopes?
What will be an ideal response?
Radio waves are much longer in wavelength than light waves, so they carry little energy, and a lot of them are needed for sharp images.
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An object 50-cm high is placed 1.0 m in front of a converging lens whose focal length is 1.5 m. Determine the image height (in cm).
A. 77 B. 150 C. 52 D. 17 E. 83
When we say that jovian planets contain significant amounts of hydrogen compounds, we mean all the following chemicals except
A) water. B) carbon dioxide. C) ammonia. D) methane.
A mass of 500 g is resting on a vertical spring with a force constant of 55.0 N/m. A mass of 250 g is dropped from a height of 12.0 cm onto the larger mass and sticks to it. What is the amplitude of the resulting oscillations?
A) 4.71 cm B) 6.34 cm C) 9.90 cm D) 11.4 cm E) 5.97 cm
The total electric flux through a closed cylindrical (length = 1.2 m, diameter = 0.20 m) surface is equal to ?5.0 N ? m2/C. Determine the net charge within the cylinder.
A. ?62 pC B. ?53 pC C. ?44 pC D. ?71 pC E. ?16 pC