HDMI 2.0 supports 4k resolution at 60Hz, but only at 30Hz. This is because HDMI 2.0 has a limited bandwidth of 18Gbps, which is not sufficient to support 4k resolution at 60Hz. The higher the resolution and refresh rate, the more data needs to be transmitted, and HDMI 2.0 simply does not have the capacity to handle the increased data requirements at 60Hz. As a result, the maximum refresh rate for 4k resolution on HDMI 2.0 is limited to 30Hz. **

The refresh rate in computer monitors, such as a 30Hz refresh rate, refers to the number of times per second the screen is able to update the image being displayed. A 30Hz refresh rate means that the screen can refresh the image 30 times in one second. A higher refresh rate, such as 60Hz or 144Hz, results in smoother motion and reduced motion blur, making it ideal for gaming or watching fast-paced videos. A lower refresh rate may lead to a less smooth viewing experience, especially during fast-moving scenes. **

The refresh rate of a computer monitor refers to the number of times per second that the screen is able to update and display new images. A 30Hz refresh rate means that the monitor is capable of refreshing the display 30 times per second. A higher refresh rate, such as 60Hz or 144Hz, results in smoother and more fluid motion on the screen, which is particularly important for gaming and fast-paced video content. A lower refresh rate may lead to more noticeable flickering and motion blur, especially during fast movements on the screen. **

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. **

The luminous intensity is specified for reflector lamps because it measures the amount of light emitted in a specific direction, which is important for directional lighting applications such as spotlights and floodlights. Reflectors are designed to control and direct light in a specific direction, so specifying luminous intensity helps to ensure that the lamp is suitable for its intended purpose. Luminous flux, on the other hand, measures the total amount of visible light emitted by a source in all directions, which may not be as relevant for reflector lamps where the focus is on directing light in a specific direction. **