Moving electric charges make magnetic fields
a. True
b. False
Indicate whether the statement is true or false
True
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Two spaceships approach each other along a straight line at a constant velocity of 0.988c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.900c
From the point of view of the observer on Earth, what is the speed of the other ship?
In the case of alpha decay, the atomic number of the nucleus increases
Indicate whether the statement is true or false
How do astronomers measure the temperature of stars?
A. The inverse square law is used. B. By comparing the star's absolute and apparent brightness. C. The rate of change of the color of the star is measured. D. By looking at which absorption lines are present in the star's spectrum. E. Temperature is determined from the radius of the star that is measured by radar.
What becomes of the heavy elements produced by fusion in low-mass stars?
A. When the star goes supernova, they are sucked into the neutron star or black hole. B. They are blasted outward in a violent explosion. C. At the end of the star's life, they are dredged up by convection and pushed outward by photons. D. They are forever trapped in the core of the star. E. Low-mass stars do not produce heavy elements.