Question

a pulsar is thought to be a rapidly spinning neutron star. such stars can arise from the gravitational collapse of a supernovas core. it is in conserving angular momentum as it shrinks to a diameter of only several kilometers that the neutron star attains its high rotational velocity. if the neutron star continuously emits a beam of electromagnetic radiation from a spot in the magnetized plasma overlying its surface, the beam is swept around like the beacon of a lighthouse. such a radio beam, striking the earth with each revolution of the neutron star, can account for the observed radio - frequency pulsations. 29. a supernovas core becomes a neutron star because of m rotation. n gravity. o pulsation. p magnetized plasma. 30. a neutron star speeds up because it q gets smaller. r has a radio frequency. s is magnetized. t emits a beam. 31. pulsars are thought to send out a radio beam from a their magnetic poles. b explosions in their interior. c one place near their surface. d the place where the beam strikes the earth. 32. what does like the beacon of a lighthouse describe? e radiation sent out by a pulsar. f the star from which a pulsar is formed. g signals scientists send out to detect pulsars. h the path of an object caught in a pulsars gravity. 33. how often the beam from a pulsar strikes the earth depends on i how far the pulsar is from the earth. j how large the pulsar is. k how fast the pulsar is spinning. l how strong the pulsars magnetic field is.

Explanation:

1. A supernova's core becomes a neutron star due to gravitational collapse. Gravity causes the core to shrink and form a neutron star.
2. A neutron star speeds up as it gets smaller because angular - momentum is conserved and a smaller size leads to a higher rotational speed.
3. The text states that a neutron star continuously emits a beam of electromagnetic radiation from a spot in the magnetized plasma overlying its surface, so from one place near their surface.
4. The "beacon of a lighthouse" is used to describe the radiation sent out by a pulsar which sweeps around as the neutron star rotates.
5. The frequency at which the beam from a pulsar strikes the Earth depends on how fast the pulsar is spinning. The faster it spins, the more frequently the beam will strike the Earth.

Answer:

1. N. gravity
2. O. gets smaller
3. C. one place near their surface
4. E. Radiation sent out by a pulsar
5. K. how fast the pulsar is spinning