Atomic Nucleus: An yttrium isotope has 39 protons and 50 neutrons in its nucleus. Which one of the following symbols accurately represents this isotope?
A. 
Y
B. 
Y
C. 
Y
D. 
Y
E. 
Y
Answer: C
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Light is incident normally from air onto a liquid film that is on a glass plate. The liquid film is 164 nm thick, and the liquid has index of refraction 1.60. The glass has index of refraction n = 1.50
Calculate the longest visible wavelength (as measured in air) of the light for which there will be totally destructive interference between the rays reflected from the top and bottom surfaces of the film. (Assume that the visible spectrum lies between 400 and 700 nm.)
__________________ is the agitation among the molecules and/or atoms of a body
Fill in the blank(s) with correct word
The Kelvin temperature scale is based on the freezing point of water
a. True b. False Indicate whether the statement is true or false
This figure shows a "slice of the universe" from the Sloan Digital Sky Survey. What is the Sloan Great Wall (indicated by the arrow)?
A) a huge collection of galaxies extending a billion light-years in length B) a giant wall of hot gas extending a billion light-years in length C) our cosmological horizon, the point beyond which we cannot see D) a hypothesized structure built of the particles responsible for creating dark energy in the universe