A blackbody, which is an âidealâ or âperfectâ emitter (that means its emission properties do not vary based on location or the composition of the object), emits a spectrum of light with the following properties: The hotter the blackbody, the more light it gives off at all wavelengths. That is, if you were to compare two blackbodies, regardless of what wavelength of light you observe, the hotter blackbody will give off more light than the cooler one.
Right-click on the disc and select Eject, or select the disc and then click on the blue Eject button on the top toolbar of the application window. 3. Restart your Mac while holding down the mouse or trackpad button. Make sure you hold it down until your computer has fully restarted.
Look for the DVD holder inside the DVD player. This device holds the DVD in place while the DVD player reads the disk. Push the stuck DVD disk toward the front of the DVD player until the DVD ejects. Remember the DVD player is not on and some force must be applied. Replace the casing and the screws. Plug the player in and turn it on. Put another DVD in to test whether the player is working properly.