When radium-224 emits an alpha particle, the remaining daughter nucleus is which of the following?
a. lead-213
b. actinium-215
c. radon-220
d. bismuth-215
c
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If the Sun ceased to generate nuclear fusion in its core, the Sun would immediately begin to collapse inward
a. True b. False Indicate whether the statement is true or false
Ariel claims that a pulse is described by the equation 
where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x?vt. Which one, if either, is correct, and why?
A.
B.
C.
D.
E.
is infinite when x = 0.What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. C) Although dark matter emits no visible light, we have detected its radio emissions. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.
In a two-slit experiment, the slit separation is 3.00 × 10-5 m. The interference pattern is created on a screen that is 2.00 m away from the slits
If the seventh bright fringe on the screen is a linear distance of 10.0 cm away from the central fringe, what is the wavelength of the light? A) 100 nm B) 204 nm C) 214 nm D) 224 nm E) 234 nm