Why do we use microwave for communication? Uses. Microwaves are widely used for point-to-point communications because their small wavelength allows conveniently-sized antennas to direct them in narrow beams, which can be pointed directly at the receiving antenna. What type of information can be sent by microwaves? Microwaves are used mostly for point-to-point communications systems to […]
Are false lashes bad for you?
Are false lashes bad for you? Unfortunately, fake eyelashes may also cause temporary or permanent loss of your real eyelashes. Taking the fake lashes off can break your natural lashes, and even damage the hair follicle. When this happens, your own lashes can fail to grow back. How do you get eyelash extensions off without […]
What is example of negative work?
What is example of negative work? Negative work follows when the force has a component opposite or against the displacement. Negative work removes or dissipates energy from the system. Two examples: In pulling a box of books along a rough floor at constant velocity, I do positive work on the box, that is I put […]
Where do we use concave and convex mirrors?
Where do we use concave and convex mirrors? Concave mirror is used by dentist, solar furnace, reflector of a torch, etc. Convex mirror is used in rear view mirrors. What do concave and convex mirrors have in common? Similarities between lenses and mirrors A convex lens acts a lot like a concave mirror. Both converge […]
What is the relationship between the kinetic energy of an object?
What is the relationship between the kinetic energy of an object? Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters […]
Why do we need energy to remove an electron?
Why do we need energy to remove an electron? The energy needed to remove an electron from a neutral atom is the ionization energy of that atom. It is easier to remove electrons from atoms with a small ionization energy, so they will form cations more often in chemical reactions. What would happen if an […]
Is symbiosis important to an ecosystem?
Is symbiosis important to an ecosystem? Symbiotic relationships are important because they are a major driving force of evolution. This networking and cooperation among species allows them to survive better than they would as individuals. How can symbiosis hurt the ecosystem stability? In symbiotic relationship such as mutualism and commensalism, both the organism survived and […]
How would you classify the change in matter when wood is burned?
How would you classify the change in matter when wood is burned? Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. Other examples include burning of a candle, […]
What happens if we drink expired beer?
What happens if we drink expired beer? Expired alcohol doesn’t make you sick. If you drink liquor after it’s been open for more than a year, you generally only risk a duller taste. Flat beer typically tastes off and may upset your stomach, whereas spoiled wine usually tastes vinegary or nutty but isn’t harmful. Can […]
What is the goal of a psychologist?
What is the goal of a psychologist? In the broadest of terms, a psychologist’s goal is to study and treat people who have mental illnesses or emotional difficulties, or to provide research on human behavior and how people think. There are three main types of psychologists – research, counseling and applied – and many specializations. […]