How do radio interferometers greatly enhance resolution in radio wavelengths?
What will be an ideal response?
Hooking two or more radio dishes together with a computer lets us get resolution not equal to the diameters of the dishes, but to the separations between the scopes.
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Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 10 m2 using paper (k = 3.7) of thickness 1.0 mm as a dielectric, how much electrical energy would it store at a plate voltage of 5000 V? (e0 = 8.85 × 10^-12 C2/N×m2)
a. 4.1 J c. 0.41 J b. 8200 J d. 82,000 J
The radio radiation emitted by a radio lobe is mainly synchrotron radiation
a. True b. False Indicate whether the statement is true or false
Which one of the following units is the correct SI unit for the electromotive force (emf)?
a) newtons (N) b) coulombs (C) c) joules (J). d) amperes (A) e) volts (V)
What do we mean by length contraction in relativity?
A) It is the idea that if you measure the size of an object moving relative to you, you will find that in the direction of motion it is shorter than it would be at rest, while its size in other directions is unchanged. B) It is the idea that if you measure the size of an object moving relative to you, you will find that it is shorter in every direction than it would be at rest. That is, length, width, and height are all shorter for an object when it is moving by you. C) It is the idea that moving objects look smaller than nonmoving objects, but their sizes have not really changed. D) It is the idea that if you travel fast, you'll notice yourself getting shorter.