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docs/reference/js/lessons/smiley/quiz-answers.md

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+# smiley quiz answers
+
+#LED #screen #animation #docs
+
+This is the answer key for the [smiley quiz](/microbit/lessons/smiley/quiz).
+
+## 1. Define 'show animation' : 
+
+A function that will show a series of image frames on the LED screen, pausing the specified time after each frame.
+
+## 2. Why is there an extra empty frame after the smiley face?
+
+```
+basic.showAnimation(`
+. # . # . . . . . .
+. # . # . . . . . .
+. . # . . . . . . .
+# . . . # . . . . .
+. # # # . . . . . .
+`, 400)
+```
+
+<br/>
+
+<br/>
+
+The extra empty frame creates a blinking smiley, allowing the BBC micro:bit to alternate between showing the smiley and the empty screen.
+
+## 3. Change the delay shown from 400 milliseconds to 1000 milliseconds.
+
+```
+basic.showAnimation(`
+. # . # . . . . . .
+. # . # . . . . . .
+. . # . . . . . . .
+# . . . # . . . . .
+. # # # . . . . . .
+`, 400)
+```
+
+<br/>
+
+```
+basic.showAnimation(`
+. # . # . . . . . .
+. # . # . . . . . .
+. . # . . . . . . .
+# . . . # . . . . .
+. # # # . . . . . .
+`, 1000)
+```
+
+## 4. Now let's change the delay shown below from 400 milliseconds to 2.5 seconds.
+
+![](/static/mb/lessons/smiley-0.png)
+
+```
+basic.showAnimation(`
+. # . # . . . . . .
+. # . # . . . . . .
+. . # . . . . . . .
+# . . . # . . . . .
+. # # # . . . . . .
+`, 400)
+```
+
+<br/>
+
+```
+basic.showAnimation(`
+. # . # . . . . . .
+. # . # . . . . . .
+. . # . . . . . . .
+# . . . # . . . . .
+. # # # . . . . . .
+`, 2500)
+```
+