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Scientists are interested in quantum dots because they last much longer than conventional dyes used to tag molecules , which usually stop emitting light in seconds . Second are passive systems that utilize an objects own emitted or reflected energy , gathered from ambient illumination or environmental influences . Neutrinos are particles that are emitted during beta decay . Electromagnetic waves are emitted by radio and radar transmitters ( radio waves ) , hot bodies and excited gases ( infrared , visible , and ultraviolet light ) , atoms struck by high-energy particles ( x-rays and gamma rays ) , radio-active substances ( x-rays and gamma rays ) , and cosmic sources ( x-rays and gamma rays ) . It is argued that an object melts because the molecules have lost their information about where they are supposed to be ( that is , they have emitted computrons ) . The capacity of the Hashtable ( the length of the bucket array ) is emitted ( int ) , followed by the size of the Hashtable ( the number of key-value mappings ) , followed by the key ( Object ) and value ( Object ) for each key-value mapping represented by the Hashtable The key-value mappings are emitted in no particular order . The pollutants of suIfur dioxide and the oxides of nitrogen are emitted on a local scale ; but through the mechanism of long range atmospheric transport their effects are evident on the global scale in the form of acid rain . If the - P flag is present in the command line , this option has no effect , since no " #line " directives are emitted whatsoever . The SMMR and SSM / I instruments are microwave radiometers that sense emitted microwave radiation .