Alpha decay reduces the atomic and mass numbers respectively by how much?
A) 4, 2
B) 2, 2
C) 2, 4
D) 4, 4
E) 2, 6
C
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Astronomers often record solar images in the ____ part of the electromagnetic spectrum because the gaseous layers high in the Sun's atmosphere are very hot and emit most of their light at short wavelengths
a. microwave b. gamma c. visible light d. ultraviolet e. infrared
The ________ phenomenon is an extremely energetic event which apparently occurs in the nuclei of massive galaxies during an early stage of their evolution
Fill in the blank(s) with correct word
The electric potential inside a charged solid spherical conductor in equilibrium
A. is always zero. B. is constant and equal to its value at the surface. C. decreases from its value at the surface to a value of zero at the center. D. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. E. is equal to the charge passing through the surface per unit time divided by the resistance.
How do we learn about the conditions at the center of our own galaxy, the Milky Way?
A) The gas and dust in the Milky Way prevent any type of direct observation of the galactic center, but theoretical models allow us to predict what is happening there. B) We must look at the centers of other (external) galaxies and assume that they are similar to the Milky Way. C) While we cannot see the galactic center with visible or ultraviolet light, radio and X-rays from the center can be detected and used to determine the conditions there. D) High-resolution photographs obtained by the Hubble Space Telescope have revealed the galactic center using visible light.