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.
Try this-Control Panel-Device Manager-CD/DVD-double click the device-Driver's Tab -. click Update Drivers (this will likely do nothing) - then RIGHT CLICK the drive-UNINSTALL -. REBOOT this will refresh the default driver stack.Even if drive is not shown continue below. finally realized that the computer deletes the CD/DVD label and names the drive the same as the name on the disc. If you right click on that name, you get a drop down that has eject as an option. Once the disc was ejected, the CD/DVD image came back. then a right click gives a dropdown with options.