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.
Q: How do I eject my CD if I don't have an eject key on my keyboard? A: There are several ways to eject your Cd tray, the most common is holding down the F12 key or by clicking the eject button in iTunes. More information on these and more below. Some newer 3rd party Apple keyboards are shipping with eject keys on them. Q: I just bought a new CD/CDRW/SuperDrive and the unit is missing the eject key? A: Apple shipped these drive without an eject key because it is not needed. You can eject your media from any keyboard by holding down the F12 key.