Q. A student has set up the the He-Ne laser (632.8 nm) and a diffraction grating with unknown slit spacing as shown in Figure 9.5. When the diffraction plate is 44.0 cm from the diffraction scale, the first order spots are measured at 19.8 cm either side of the optical axis. What is the line spacing of the diffraction grating in lines per centimeter?
Q. A cylinder of gas at room temperature (20°C) has a pressure p1. To what temperature in degrees Celsius would the temperature have to be increased for the pressure to be 2.7p1?