Explain the "Lighthouse Model" of pulsars
What will be an ideal response?
A neutron star has a very strong magnetic field and spins very rapidly. The strong electrical and magnetic fields of the neutron star create powerful beams of high-energy radiation emerging from the magnetic poles of the neutron star.
The neutron star rotates around its axis, but its axis also rotates, sweeping these beams of rotation through space - much like the light beams from a lighthouse. When the beam is directed in the direction of Earth, a pulse of energy is detected. The beam quickly moves away, and is not detected from Earth.
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Four of the five answers listed below are aspects of the scientific method. Select the exception
a. observation b. hypothesis c. experimentation d. philosophy e. conclusion
Sunsets are red because sunlight must pass through more atmosphere then, and the atmosphere scatters even more light at bluer wavelengths, transmitting mostly red light
Indicate whether the statement is true or false
Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true?
a. The current through R equals the current through R1. b. The voltage across R equals the voltage across R1. c. The power given off by R equals the power given off by R1. d. R is less than R1.
Convex (converging) lenses are worn by
A. a nearsighted person to make rays from a nearby object diverge less strongly. B. a farsighted person to make rays from a distant object diverge more strongly. C. a farsighted person to make rays from a nearby object diverge less strongly. D. a nearsighted person to make rays from a distant object diverge more strongly.