15. Lenses are coated with thin film to reducea. Diffractiond. Refraction10. Which of the following produces an interference pattern with a broad central bright fringewith a width twice that of the secondary maximum?a. Crystalline solidc. Double slitb. PolarizationC. Reflectionb. Diffraction grantingd. Single slit17. What is the effect of increasing the number of lines ruled on a diffraction grating?a. The spectrum produced will be broader.b. The interference pattern will be less sharp.c. Only shorter wavelengths can be diffracted.d. The distance between the slits will be increased.18. Crystal structures are analyzed usinga. Diffraction gratingC. Single slit19. Which of the following will increase the separation between the dark fringers in thediffraction pattern produced by a single slit?a. Decreasing both the wavelength of light and the width of the slit by the same amount.b. Increasing the wavelength of light used and the width of the slit by the same amount,c. Decreasing the wavelength of light and increasing the width of the slit by the sameamount.b. Double slit .d. X-ray diffractiond. Increasing the wavelength of light used and decreasing the width of the slit by theamount.20. A diffraction grating has 450 lines/cm. Up to what order of the entire visible spectrum willbe produced?а. 121. For two light sources to be coherent, they must have the samea. Colorc. Phase22. For the interference pattern produced by a double slit, what order n is assigned to thecentral bright band?a. 023. For total destructive interference to happen, the path difference between two interferingb. 2c. 3d. 4b. Frequencyd. Wavelengthb. 1C. 2d. 3waves must bea. A/424. Which type of radioactive decay does not exhibit transmutation?a. Alpha decay25. What is the mass number of an alpha particle?.a. 126. If a position is emitted from a radioactive nuclide, what will be the atomic number of thenuclide?a. Decreases by 1C. Increase by127. What decay mechanism is involved in the transformation of 1Au to r?b. 2/2C. 2d. 24b. Beta decayc. Electron captured. Gamma decayb. 2c. 3d. 4b. Remains the samed. Increase by 2decaydecaya ab. +B decayC.-A28. To attain stability, those with atomic number greater than 83 must undergo what type ofdecay?a. 829. Where is the bulk of the mass of an atom concentrated?a. Electron30. What do you call the force that holds the nucleus together?a. Electromagnetic forcec. Strong nuclear force31. Consider tantalum with work function of 5 ev. The incident radiation belongs to what regionof the electromagnetic spectrum?a. Infraredd. ydecayb. 80c. 160d. 200b. NeutronC. Nucleusd. Proton* b. Gravitational forced. Weak nuclear forceb. Microwavec. Ultravioletd. x-ray

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15. Lenses are coated with thin film to reduce a. Diffraction d. Refraction C. Reflection foronce nattern with a broad central bright fringe b. Polarization