�
| dalton's law of partial pressures |
| damped oscillator | |
| de Broglie waves | | |
| defects in crystals | |
| degenerate semiconductor | |
| degrees of freedom | |
| density | |
| deuteron | |
| dew point | |
| dielectric | |
| diffraction Fraunhofer at circular aperture | |
| diffraction Fresnel | |
| diffraction grating | |
| diffraction of light | |
| diffraction fraunhofer at rectangular slit | |
| diffusion | |
| dimension | |
| diode | |
| dioptre | |
| dipole electric | |
| dispersion |
| displacement current |
| d lines of sodium |
| Doppler effect |
| dyne |
