# Physics 203 at Portland State 2014

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exam_1_review
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exam_1_review [2014/04/19 08:09]
wikimanager [Review problem 1]
exam_1_review [2014/04/19 19:26] (current)
wikimanager [Review problem 1]
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* a) Which of these waves travel in the $+x$ direction? (3 pts)   * a) Which of these waves travel in the $+x$ direction? (3 pts)
-    * <color green>​waves 1 and 4</​color>​+    * <color green>​waves 1 and 4 </​color>​
+      * <color green>​(look for opposite signs in front of the //x// and //t// terms inside the cos or sin function)</​color>​
* b) Which of these waves have the same wavelength as wave 1?  (3 pts)   * b) Which of these waves have the same wavelength as wave 1?  (3 pts)
-    * <color green>​wave 4</​color>​+    * <color green>​wave 4 </​color>​
+      * <color green>​(look for the same magnitude of the coefficient in front of //x// inside the cos or sin function)</​color>​
* c) Which of these waves have the same amplitude as wave 2? (3 pts)   * c) Which of these waves have the same amplitude as wave 2? (3 pts)
-    * <color green>​wave 5</​color>​+    * <color green>​wave 5 </​color>​
+      * <color green>​(look for the same magnitude of the coefficient in front of the cos or sin function)</​color>​
* d) Which of these waves have the same period as wave 3? (3 pts)   * d) Which of these waves have the same period as wave 3? (3 pts)
-    * <color green>​wave 1</​color>​+    * <color green>​wave 1 </​color>​
+      * <color green>​(look for the same magnitude of the coefficient in front of //t// inside the cos or sin function)</​color>​
* e) Which of these waves have the same speed as wave 4? (3 pts)   * e) Which of these waves have the same speed as wave 4? (3 pts)
-    * <color green>​wave 5</​color>​+    * <color green>​wave 5 </​color>​
+      * <color green>​(look for the same magnitude of the ratio of the coefficients in front of //t// and in front of //x// inside the cos or sin function)</​color>​
+
+<color blue>See [[start#​equation_sheet_ch14|Equation sheet for Ch. 14, bullet #6]] for details...</​color>​
+
+===All of the parameters for each wave are summarized below===
+^  Wave  ^  Direction ​ ^  Amplitude (m) ^  Wavelength (m)  ^  Period (s)  ^  Frequency (Hz)  ^  Magnitude of speed $\left(\frac{\mathbf m}{\mathbf s}\right)$ ​ ^
+|  1   ​| ​ $+x$     ​| ​  ​0.12 ​ |  $\frac{2\pi}{3}$ ​ |  $\frac{2\pi}{21}$ ​ |  $\frac{21}{2\pi}$ ​ |  7     |
+|  2   ​| ​ $-x$     ​| ​  ​0.15 ​ |  $\frac{\pi}{3}$ ​  ​| ​ $\frac{\pi}{21}$ ​  ​| ​ $\frac{21}{\pi}$ ​  ​| ​ 7     |
+|  3   ​| ​ $-x$     ​| ​  ​0.13 ​ |  $\frac{\pi}{3}$ ​  ​| ​ $\frac{2\pi}{21}$ ​ |  $\frac{21}{2\pi}$ ​ |  3.5   |
+|  4   ​| ​ $+x$     ​| ​  ​0.27 ​ |  $\frac{2\pi}{3}$ ​ |  $\frac{\pi}{6}$ ​   |  $\frac{6}{\pi}$ ​   |  4     |
+|  5   ​| ​ $-x$     ​| ​  ​0.15 ​ |  $\frac{2\pi}{9}$ ​ |  $\frac{\pi}{18}$ ​  ​| ​ $\frac{18}{\pi}$ ​  ​| ​ 4     |

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