Online sales do not necessarily plummet, but they can fluctuate based on various factors such as consumer demand, economic conditions, and market trends. While some businesses may experience a decrease in online sales during certain periods, others may see an increase. It ultimately depends on the specific circumstances and strategies of each individual business. Additionally, online sales can be influenced by external factors such as seasonal changes, holidays, and global events. **

As an AI, I don't have personal opinions or expectations. However, the performance of Viktoria Berlin is influenced by various factors such as team dynamics, player form, and competition strength. It's not uncommon for teams to experience fluctuations in their performance, and it's possible that Viktoria Berlin's recent decline may be due to a combination of these factors. **

If the elevator suddenly starts to plummet downwards, the most important thing to do is to remain calm. Grab onto the handrails or any sturdy object inside the elevator to stabilize yourself. Bend your knees slightly and try to distribute your weight evenly to minimize the impact on your body when the elevator reaches the bottom. If possible, press the emergency button or use your phone to call for help. It's important to follow any instructions given by the emergency services or building management to ensure a safe rescue. **

It is possible that Porsche's stocks could be negatively impacted if a speed limit is imposed in Germany. Porsche is known for its high-performance sports cars, and a speed limit could potentially reduce the appeal of these vehicles to consumers. However, Porsche also offers a range of other vehicles and has a strong brand reputation, so the impact may not be as significant as some might expect. Ultimately, the effect on Porsche's stocks would depend on how well the company is able to adapt to any changes in regulations and consumer preferences. **

Self-luminous bodies are objects that emit their own light, as opposed to reflecting light from another source. Examples of self-luminous bodies include stars, the sun, and certain types of light bulbs. These objects generate their own energy through processes like nuclear fusion or electrical current, which produces light as a byproduct. **

No, the luminous clock is not radioactive. The luminescence in the clock is typically achieved using a phosphorescent material that absorbs light and then slowly releases it over time. This process does not involve any radioactive materials. The glow from the clock is simply a result of this light-absorption and emission process. **

A luminous point is a theoretical concept used in physics and optics to represent a source of light that emits light in all directions. It is often used as a simplification in the study of light and its behavior, allowing for easier calculations and analysis. In reality, a luminous point does not exist as a physical object, but it is a useful tool for understanding the behavior of light in various systems. **

Radiant energy is a type of energy that travels through space in the form of electromagnetic waves. It includes visible light, radio waves, microwaves, and other forms of electromagnetic radiation. Radiant energy is produced by the movement of charged particles and is essential for many natural processes, such as photosynthesis in plants and the warmth we feel from the sun. It is also used in various technologies, such as solar panels and communication devices. **