Q: What are materials that eject electrons when illuminated with light called?


Read this paragraph and choose the correct option from the provided answers:

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.

 Choices:

- fragmentation

- photogenic

- illumination

- photoemissive


A:
photoemissive