Question

If someone can answer any/all of these that would be much appreciated!

217 a. a. 13. What is the wavelength of this wave: y(x,t) = 5.1cm sin (5.0Hz t – 3.0 m-1x +)? 21 a. 5.1 cm b. 5.0 Hz c. 3.0 m^-1 d. e. f. 5.0Hz 3.0m 14. Which statement best describes sound waves? a. An oscillation in the temperature of a medium b. An oscillation in the pressure of a medium c. An oscillation in the wavelength of a medium 15. You hear two speakers simultaneously. One speaker plays 500Hz and another speaker plays 502 Hz. What do you hear? 501 Hz that gets loud and quiet twice per second b. 501 Hz that gets loud and quiet once every two seconds C. 1002 Hz that gets loud and quiet twice per second d. 1002 Hz that gets loud and quiet once every two seconds 16. When do you get total internal reflection? When the incident angle is larger than the critical angle b. When the incident angle is smaller than the critical angle C. Only when the incident angle equals to the critical angle 17. What type of lens can make a make a smaller, virtual image of a physical object? A diverging lens b. A converging lens c. Either a diverging or converging lens d. Neither a diverging nor converging lens 18. How does the size of an image in a flat mirror compare to the size of the object? a. The image is larger b. The object is larger C. They're the same size d. It depends on the distance between the object and mirror 19. Which type of reflection inverts the phase of a light wave? a. Reflections off of a higher index of refraction medium b. Reflections off of a lower index of refraction medium Reflections off of any medium d. No reflections invert the phase of a light wave 20. What angle between the polarization axis of light and the transmission axis of a polarizer will produce the least transmission of light through the polarizer? b. 30° C. 60° d. 75° e. 90° a. C. a. 0°

Answer 1

19)(a) Reflections off of a higher indese of refraction medium. 20) from , Malus low we know I = lo caso Io initial intensity of light wave Now, for, o=90° Mininum, Autensity is observed I = I. Casqo' ('casqu =0 II=0