UV erasable memory refers to a type of memory that can be erased by exposure to ultraviolet (UV) light. Among the given options (a) Flash memory, (b) SRAM, (c) EPROM, and (d) DRAM, the correct answer is option (c) EPROM.

EPROM stands for Erasable Programmable Read-Only Memory. It is a non-volatile memory chip that allows data to be both written and erased. EPROM is a type of ROM (Read-Only Memory) that retains its data even when the power is turned off.

EPROM is erasable using UV light, which is why it is called UV erasable. The process of erasing EPROM involves exposing the memory chip to UV light for a specific period of time. The UV light clears the charge from the memory cells, effectively erasing the data stored in the EPROM.

Below are the characteristics of EPROM and why it is UV erasable:

1. Non-volatile: EPROM is a non-volatile memory, meaning it retains data even when the power is turned off. This makes it suitable for storing critical and permanent data.

2. Programmable: EPROM can be programmed with specific data or instructions. During the programming process, electrical charges are applied to the memory cells, storing the desired information.

3. Erasable: EPROM can be erased and reprogrammed multiple times. The erasure process involves exposing the EPROM chip to UV light, which clears the charge from the memory cells. Once erased, new data can be programmed into the EPROM.

4. UV erasable: The UV light used for erasing EPROM has a specific wavelength that can penetrate the quartz window on the EPROM chip. This allows the UV light to reach the memory cells and erase the data. Once erased, the EPROM is ready to be reprogrammed.

5. Limited erasing cycles: EPROM has a limited number of erasing cycles. Each time the UV light is used to erase the EPROM, it reduces the lifespan of the memory chip. This limitation led to the development of Electrically Erasable Programmable Read-Only Memory (EEPROM) and Flash memory, which can be erased and reprogrammed electronically without UV light.

In conclusion, EPROM is UV erasable memory that can be erased by exposing it to UV light. It is a non-volatile memory chip that allows data to be both written and erased, making it suitable for storing critical and permanent data. However, its erasable nature is limited to a specific number of cycles.