3. Diffraction by a single slit in a ripple tank can be decreased by a) Increasing the frequency of the source d) Decreasing the width of the slit b) Increasing the amplitude of the waves e) Using a longer wavelength ) Decreasing the distance between the wave generator and the slit 4. Two point sources in a ripple tank vibrate in phase at a frequency of 12 Hz to produce waves of wavelength 0.024 m. The difference in path length from the two point sources to a point on the second nodal line is a) 0.6 cm d) 3.6 cm b) 1.2 cm e) 4.8 cm c) 2.4 cm 5. The particle theory is unable to account for the phenomenon of (e Radiation pressure d) Propagation b) Emission e) Reflection c) Interference Use the Figure below for questions 6 and 7. X 6. The Figure above shows a single slit with lines marking the direction to a point P in the diffraction pattern; X and Y are the edges of the slit. The possible value for the path difference PY - PX that places P at the second intensity minimum from the central maximum is a) d) 21 e) 2 c) 32 7. The possible value for the path difference PY - PX in the Figure above that takes places P at the intensity maximum nearest the central maximum is (e d) 21 e ) 2 C)