I wonder if the force to press the button has weakened..... Why is the light in the room suddenly dim? For a few days What is a collision? actions excuse physical collision For a few days I felt that the brightness of the fluorescent lights in my room had diminished slightly. Reason? I felt it was dark somehow. Of course, I didn’t measure the brightness in the room with a photometer. Therefore, the brightness I felt is due to my senses. Recently, my body temperature is measured many times every day. For that reason, inexpensive thermometers are on sale. So, if cheap Asian photometers are sold, many people will buy them. Especially anxious people like me will buy it. I stood on a chair and removed the cover of the lighting fixtures attached to the ceiling. Ring-shaped fluorescent lamp. I wrote down the model number of the fluorescent lamp. I went to the electronics store with the memo. What is a collision? We perform certain physical ...