Hosted by 8 th Grade Science

1. Jeopardy Hosted by 8th Grade Science

2. Light/ Color Quick Pick Waves Sound 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500

3. Row 1, Col 1 This is the distance between two corresponding parts of a wave. Wavelength

4. 1,2 When a wave is reflected, how does it change? What is a reflected sound wave called? The wave changes direction after striking a barrier but all other measurements stay the same. A reflected sound wave is called an echo.

5. 1,3 An object that does not transmit any light is considered this. Opaque

6. 1,4 If a wave with an amplitude of 10m undergoes constructive interference with a wave with an amplitude of 6m, what will be the amplitude of the new wave? 16 m

7. 2,1 Draw and label the parts of a transverse and longitudinal wave. Transverse Longitudinal

8. 2,2 Draw a soft and high pitched sound. Your drawing should have a small amplitude and high frequency.

9. 2,3 Which color of visible light carries the most energy? The least? Most = Violet Least = Red

10. 2,4 If a wave with an amplitude of 10m undergoes destructive interference with a wave with an amplitude of 6m, what will be the amplitude of the new wave? 4 m

11. 3,1 This is the difference between an electromagnetic and a mechanical wave. Mechanical waves need a medium to travel through, electromagnetic do not.

12. 3,2 Explain how the speed of sound changes depending on temperature and elasticity of the medium. Sound travels faster in a warmer medium. Sound travels faster in a more elastic medium.

13. 3,3 Why does a red transparent water bottle appear red? Because only red light is being transmitted, all other colors are being absorbed.

14. 3,4 Two sirens go off at the same time. One of the siren’s pitch is an octave higher than the second siren. Which sound will reach you first, the higher or lower pitched siren? Both reach at the same time because wave speed is not dependent on frequency like pitch.

15. 4,1 This is the measurement of how far a particle moves away from rest position. (The height of a wave) What is amplitude?

16. 4,2 What is sonar? This is a type of technology that uses echoes to locate objects.

17. 4,3 Why does an opaque object appear Black? White? Red? Black = all wavelengths of visible light are being absorbed White = all wavelengths of visible light are being reflected Red = red light is being reflected all other colors are being absorbed

18. 4,4 Stevie was having a hard time learning to spear fish. He was sure that his aim and throws were right on line with where he saw the fish. However, he was constantly missing his target (the fish). What contributed to his lack of success? Stevie was seeing the fish in the wrong place because light refracts as it passes from air to water. This gives an optical illusion to where the fish really is.

19. 5,1 How fast does a 200 Hz wave travel if its wavelength is 0.5 m? Show FSAU! S = wavelength x frequency S = 0.5 m x 200 Hz S = 100m/s

20. 5,2 This explains the apparent change in pitch of a passing police cars siren. (give the proper vocabulary term and explain what is happening!) The Doppler Effect – as a sound passes in front of you the wave frequency changes causing you to hear a change in pitch as the sound approaches and then moves past you.

21. 5,3 What is the difference between transparent, translucent and opaque objects? Describe how we see the color of each of these objects. Transparent = you can see clearly through, appears whatever color it transmits Translucent = scatters light as it transmits it so you can not see directly through it appears whatever color it transmits Opaque = Does not transmit light, it appears whatever color it reflects, it absorbs all others

22. 5,4 A submarine that is stationary sends out a sonar sound wave traveling at 1,500 m/s, which reflects off a sunken ship to the submarine. The crew receives the reflected wave 8 seconds after it was sent out. How far away is the sunken ship? 1,500m/s X 8s= 12,000 m 12,000m /2= 6,000m