What are X-ray bursters?
A) They are the central sources of energy for planetary nebulae.
B) They are very massive stars that explode as supernovae, emitting bursts of X- rays and gamma-rays in the process.
C) They are rapidly rotating black holes whose precession points their poles toward us on occasion.
D) They are violent energy sources known to lie at the heart of the Milky Way and similar massive galaxies.
E) They are neutron stars on which accreted matter builds up, then explodes in a violent nuclear explosion.
E
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Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. An ohm-meter across any two points of the triangle will show the equivalent resistance to be
A) 1.4 ohms. B) 5 ohms. C) 6.7 ohms. D) greater than 6.7 ohms.
Explain why we have seasons and compare/contrast the cycle of seasons for both hemispheres
What will be an ideal response?
Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following?
a. proton c. nucleus b. neutron d. positron
Why do single-dish radio telescopes have poor resolving power compared to optical telescopes of the same diameter?