16. In what way is the spinning neutron star like a lighthouse? A. It illuminate
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Question
16. In what way is the spinning neutron star like a lighthouse? A. It illuminates all places around itself. B. A beam of light sweeps around the neutron star.
17.What makes the spinning neutron star pulse on and off (earning it the name “pulsar”)? A. Magnetism of the object flips upside down periodically (reverses polarity). B. The object wobbles similar to the Earth’s cycle of precession. C. A rotating beam of light sweeps past us for a moment (so we see a pulse).
18. The Crab Nebula pulsar spins and pulses at a pretty average rate for a pulsar. So, how often do pulsars spin and pulse? A. Many times per second B. Once every few minutes C. Every few years
19. Continue with Section 12-7: Magnetars. How does their magnetism compare to that of normal neutron stars? A. Much stronger B. Much weaker C. No difference
20.What causes strong bursts of x-rays and gamma rays to be emitted from the magnetar? A. There is interference by the gravity of a large nearby black hole. B. Material is flowing from a giant star onto the magnetar. C. The surface is buckling, rupturing, or erupting due to extreme magnetism.
Explanation / Answer
16. B: - Due to non alignment of rotation and magnetic axes it appears that a beam of light sweeps around the neutron star.
17. C:- In case of a pulsar the radiation coming towards the earth sweeps past us for moment, this may be a periodic phenomena sa the pulsar appears to pulsate.
18. A:- Crab Nebula pulsar rotates 30 times in a second.
19. A:- A Magnetar can have as much high magnetic field as 10^10 Tesla.
20. C:- The high Magnetic field are at cost of rotation energy so this will decrease the rotation of star and causes a starquake which in turn pump so much energy into the surrounding gases that it emits X rays and Gamma rays bursts.
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