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Michal Moskal
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# flashing heart blocks quiz answers
Learn how to create an image with a variable.
This is the answer key for the [flashing heart quiz](/microbit/lessons/flashing-heart/quiz).
## 1. Describe what pause does
Pause program execution for the specified number of milliseconds.
## 2. Write the code that leaves an image on the screen for 1 second (1000 milliseconds)
<br/>
![](/static/mb/blocks/lessons/flashing-heart-5.jpg)
## 3. Write the code that leaves an image on the screen for 1.5 seconds (1500 milliseconds)
![](/static/mb/blocks/lessons/flashing-heart-6.jpg)
<br/>