Final answer:
The type of electromagnetic radiation emitted from the instrument with a frequency of 1.4 x 10^18 Hz is X-ray radiation, which is identified by its position on the electromagnetic spectrum.
Step-by-step explanation:
If a laboratory instrument emits photons with a frequency of 1.4 x 1018 Hz, the type of electromagnetic radiation emitted from the instrument is X-ray. This can be determined by looking at the electromagnetic spectrum, which ranges from radio waves with the lowest frequencies up to gamma rays with the highest frequencies. X-rays are found in a frequency range above ultraviolet radiation and below gamma rays. Typically, frequencies of X-rays range from about 3 x 1016 Hz to 3 x 1019 Hz. Therefore, a frequency of 1.4 x 1018 Hz falls within the range of X-ray frequencies.