Please answer the following question: Answer the following question given this paragraph: Materials that eject electrons when illuminated with light, such as potassium, are called photoemissive. Not all materials are photoemissive, nor are all light sources capable of initiating electron emission from a given substance. For example, in Figure above , we see that 700 nm light will not initiate electron ejection, while 550 nm light will. Q: What are materials that eject electrons when illuminated with light called? Choices: - fragmentation - photogenic - illumination - photoemissive A:
A:
photoemissive