A metal wire of resistance R is cut into three equal pieces that are then placed together side by side to form a new cable with a length equal to one-third the original length. What is the resistance of this new cable?
1. 1/9 R
2. 1/3 R
3. R
4. 3R
5. 9R
1
Physics & Space Science
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The most common isotope of oxygen has atomic number 8 and atomic mass number 16. Another isotope has two extra neutrons. What are the atomic number and atomic mass number of this isotope?
What will be an ideal response?
Physics & Space Science
A star on the red giant branch has a core about the size of ________
Fill in the blank(s) with correct word
Physics & Space Science
The Roche limit refers to a ________.
A. distance B. speed C. density D. mass E. force
Physics & Space Science
A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is 328 nm, which of the following wavelengths of visible light is strongly reflected?
a. 621 nm (orange) b. 547 nm (green) c. 590 nm (yellow) d. 707 nm (red) e. 429 nm (violet)
Physics & Space Science