Option 1: Y-rays

Y-rays are not a recognized form of radiation and have no effect on reading old written materials. This option can be ruled out.

Option 2: X-rays

X-rays are a form of electromagnetic radiation and can penetrate through materials. They are commonly used in medical imaging to see through the human body. Similarly, X-rays can be used to read old written materials by passing them through the material and capturing the image on a detector. X-rays have high energy and can penetrate through dense materials, making them a suitable option for reading old written materials.

Option 3: IR-rays

IR-rays or infrared rays are also a form of electromagnetic radiation, but they have longer wavelengths compared to X-rays. Infrared rays are commonly used in night-vision cameras and remote controls. However, when it comes to reading old written materials, IR-rays might not be as effective as X-rays. Infrared rays have limited penetration power, and the ink or pigments used in old written materials might block the transmission of IR-rays, making them hard to read.

Option 4: Radiofrequency waves

Radiofrequency waves have even longer wavelengths compared to IR-rays and are commonly used in radio and television broadcasting. These waves have very limited penetration power and are