Waves, Light, and Sound

Grade 4 Science Worksheet - Building Confidence

Circle the answer.

1. 1.

   Wave A has crests 2 cm apart. Wave B has crests 6 cm apart. Which is true?

   • Wave B has the longer wavelength
   • both have the same wavelength
   • Wave A has the longer wavelength
2. 2.

   Water waves in a tray have a small amplitude. A student makes the waves taller. What else is true?

   • the waves now carry less energy
   • the crests are now farther apart
   • the waves now carry more energy
3. 3.

   What is the lowest point of a wave called?

   • the crest
   • the amplitude
   • the trough
4. 4.

   Why can't you see your book in a completely dark room?

   • your eyes stop working at night
   • no light bounces off it into your eyes
   • the book disappears in the dark
5. 5.

   Which object reflects the most light?

   • a black cloth
   • a piece of dark felt
   • a shiny mirror