Protons in the nucleus attract electrons with enough electromagnetic force to keep them in orbit at high speeds. Protons in general repel each other, but in the nucleus they are bound together. How is this possible?
The strong force binds protons to protons (all nucleons in fact) over very small distances of about 10-15 m. The strong force is two orders of magnitude larger over those distances than the electromagnetic force. The nucleus does succumb to electromagnetic repulsion with large values of A, the nucleon number.
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Which of the following is NOT a method used by astronomers to detect and study exoplanets?
A. direct imaging B. gravitational lensing C. rotational mapping D. doppler shift E. transit detection
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
A. straight lines in space that go from one magnetic charge to another. B. straight lines in space that are parallel to the wire. C. straight lines in space that are perpendicular to the wire. D. circles that have their centers on the wire and lie in planes perpendicular to the wire. E. circles that have the wire lying along a diameter of the circle.
A unit of angular diameter could be meters
a. True b. False Indicate whether the statement is true or false
Two charged particles repel each other with a force F. If the charge of one particle is doubled and the distance between them is doubled, the force will be
A) F. B) 2 F. C) F/2. D) F/4. E) none of the above