What are the standard units for apparent brightness?
A) watts
B) joules
C) newtons
D) watts per second
E) watts per square meter
E) watts per square meter
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Radioactivity Basics: A radioactive isotope of atomic number Z emits an alpha particle, and the daughter nucleus then emits a beta-minus particle. What is the atomic number of the resulting nucleus?
A. Z - 1 B. Z + 1 C. Z - 2 D. Z - 3
The horizontal rows of the periodic table are called ______________
Fill in the blank(s) with correct word
A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 3.6 × 10^-4 m c. 1.8 × 10^-5 m b. 1.8 × 10^-4 m d. 3.6 × 10^-5 m
Compared to Jupiter and Saturn, Uranus and Neptune
A) are substantially larger B) contain a much higher proportion of hydrogen compounds C) have no ring systems D) are much more massive