Across
- 4. wave / Santa’s sleigh moving through the city while rising and falling constantly
- 5. / Music and talking mixing together
- 8. / The time between each verse of a Christmas carol
- 9. / The length between light bulbs on hanging Christmas lights
- 11. / The top star of the Christmas tree
- 14. / Light entering a Christmas snow globe and bending
- 15. wave / People squeezing together and spreading out to get those last-minute Christmas gifts
- 17. of reflection / The principle explaining equal in-and-out angles on a shiny ornament
- 18. interference / Family voices singing the same carol build into a louder song
- 19. waves / Ripples from falling marshmallows moving across the top of hot chocolate
- 20. of incidence / The angle sunlight strikes an icy window in the morning
- 22. wave / A child crossing two bow ties alternately without the motion travelling
- 23. / How often “All I Want for Christmas” plays on the radio
Down
- 1. interference / Blasting music in headphones so loud that cousins screaming near the gifts are not heard
- 2. pulse / One single snowball thrown during a snowball fight
- 3. / Holiday lights spreading out after passing through a narrow doorway
- 6. / A spot where a string of Christmas lights is nailed down and never shakes in the wind
- 7. of superposition / When multiple celebrations happen together, their effects add up
- 10. / A candy cane standing straight up, perpendicular to a dessert cake
- 12. wave / A warm scarf flapping right and left in the snowy wind
- 13. / The silence when everyone sleeps after New Year’s Eve dinner
- 16. / The place where New Year fireworks cause the strongest vibrations
- 20. / The height difference between the tallest and lowest reindeer jump
- 21. of reflection / The angle Santa jumps up after bouncing off the roof