page 13 17. Which row in the table shows what happens to the speed, frequency, and wavelength of red light as it passes from diamond into air? Speed Frequency Wavelength A decreases decreases no change B decreases no change decreases C decreases increases increases D increases no change increases E increases increases increases 18. The output from a signal generator is connected to an oscilloscope. The trace seen on the oscilloscope screen is shown. div div The Y‑gain setting on the oscilloscope is 2.0 V/div. The time base setting on the oscilloscope is 5 ms/div. Which row in the table gives the rms voltage and the frequency of the output from the signal generator? rms voltage (V) Frequency (Hz) A 4.2 25 B 4.2 40 C 6.0 40 D 6.0 200 E 8.5 25 [Turn over