Contact

b) Why do astronomers find distant stars using radio telescopes instead of telescopes? First of all, what is a radio telescope? The first invisible spectral region widely used for astronomical observation is the radio frequency band. Telescopes observed at these wavelengths are often referred to as radio telescopes. The radio wave telescope can be much larger than the optical / infrared telescope because the wavelength of radio waves is much longer than the wavelength of light.

There are two types of contact transfer mode: direct contact transmission and indirect contact transmission. As its name implies, direct contact infection involves direct contact between the body surface and the body surface, and physical movement of the bacteria between the susceptible host and the infected or established individual. Examples of such contacts include bathing or changing the orientation of the patient. Indirect contact propagation involves contact between a susceptible host and a susceptible host, such as unmodified gloves between medical devices, bandages, patients, or hands that have not been washed.

In direct proliferation, the infectious agent is transferred from the reservoir to the susceptible host by direct contact or droplet diffusion. Through skin contact, kissing and sexual contact are in direct contact. Direct contact also refers to contact with soil or vegetation containing infectious organisms. Therefore, infectious mononucleosis ("kiss disease") and gonorrhea are transmitted from person to person through direct contact. Hookworms spread by direct contact with contaminated soil. Droplet diffusion refers to a relatively large, short-range aerosol spray that sneezes, coughs or even by speaking. Droplet diffusion is classified as direct because it is delivered by direct injection several feet before the droplet falls to the ground. Pertussis and meningococcal infections are examples of diseases spreading to susceptible hosts via droplet diffusion from infectious patients.

The virus usually diffuses by intimate contact with respiratory droplets of the patient's infection. The main way of communication is intimate contact. Infected people sneeze or cough in the air, and their sprint distance is about 3 feet. When a healthy person is standing near (about 3 feet), the droplets enter the mucosa of the nose, eyes and mouth. SARS can spread by touching infected objects and then touching nose, eyes, mouth. Close contact also means sharing your tableware, kissing and hugging, and talking to and standing with the patient. There is no evidence data on airborne propagation. You can prevent breeding by identifying and quarantining infected objects. The most important step to prevent disease spread is the use of alcohol based hand sanitizer, or hand disinfection with soap and water. Because waterdrops spread SARS, it is also important to wear appropriate masks.