Which is NOT true about neutron stars?
A. They have radii much larger than the Sun.
B. They sometimes are observed as pulsars.
C. They sometimes remain after a supernova.
D. They are rapidly rotating.
E. They have strong magnetic fields.
Ans: A. They have radii much larger than the Sun.
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Which telescope will be launched into solar orbit and eventually replace observations made by the Hubble Space Telescope?
a. Hinode b. Kepler c. Chandra d. JWST e. Fermi
Since the time Arrhenius made his prediction, the carbon dioxide concentration has risen by about 30% and the global average temperature has risen by about 1°C. Which statement below best describes how scientists should evaluate Arrhenius’s prediction?
A. The actual change is so much lower than Arrhenius predicted that we must conclude he was wrong in his assumption that a rising carbon dioxide concentration would lead to global warming. B. The actual change is so much higher than Arrhenius predicted that we must conclude that he was incorrect in assuming that the carbon dioxide concentration affects the climate. C. Although Arrhenius’s prediction was not exact, the actual change is similar enough to the predicted change to validate the general idea that a rising carbon dioxide concentration would lead to global warming. D. We cannot evaluate Arrhenius’s prediction, because he made a prediction for a 50% rise in the carbon dioxide concentration and the actual rise since his time has been only about 30%.
A beam of X-rays at a certain wavelength are scattered from a free electron at rest and the scattered beam is observed at 45.0° to the incident beam. What is the Compton shift?
A) 1.75 × 10-13 m B) 2.76 × 10-13 m C) 0 m D) 3.56 × 10-13 m E) 7.11 × 10-13 m
A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining 4 times the speed received in the situation described here?
a. 2.00d b. 0.50d c. 4.00d d. 16.00d