A pulse in a more dense medium is traveling towards the boundary with a less dense medium. Medium 1 Medium 2 More Dense Less Dense The partially reflected wave will be with respect to the incident wave. O a. 180° in phase O b. 180° out of phase O c. in phase O d. 270° out of phase

27. Which wavelength is not a possibility for a 1 m long pipe open at both ends? O A. 0.25 m O B. 0.5 m OC. 1 m O D. 2 m O E. 4 m Back Save & Continue

43. Light waves pass through an opening and interfere, producing bright and totally dark areas. Which of the following statements is true with regard to the areas that are produced? a. The bright areas are produced by destructive interference of light waves b. The totally dark areas are produced by the destructive interference of light waves C The bright areas are produced by the constructive interference of light waves d. The totally dark areas are produced by the constructive interference of light waves