Category: Physics

What is the full form of laser? Light amplification by stimulated emission of radiation What are the uses of laser technology? Lasers are widely used for laser material processing in manufacturing, e.g. for cutting, drilling, welding, cladding, soldering (brazing), hardening, surface treatment, marking, engraving, micromachining, pulsed laser deposition, lithography, etc. What is Laser What are […]

Why do we use 8.314 as the value for R? R = 8.314 is actually the more important value because it is expressed in SI units (note that 1 J = 1 Pa * m^3= 1 N/m^2 * m^3 = 1 N * m). What does R mean in chemistry? R group: An abbreviation for […]

When was the speed limit 55 mph? 1974 How many feet do you need to stop at 55 mph? 300 feet What is the highest speed limit in the US? 85 mph What was the speed limit in the 70s? The National Limit of 55 mph The cost of rising fuel prices caused many states […]

Is running 11 mph fast? So in terms of sprinting, your time would be below average for a track sprinter. At 11 miles per hour you would finish the 100 dash in 20 seconds which isn’t that great for a 6th, 7th, or 8th grader runner. However, if you’re not in track then a 20 […]

What is a symbol for a stationary front? A stationary front is represented by alternating blue and red lines with blue triangles pointing towards the warmer air and red semicircles pointing towards the colder air. A noticeable temperature change and/or shift in wind direction is commonly observed when crossing from one side of a stationary […]

What body parts do birds use for food? Beaks and Bills – Owls, hawks, kingfishers and other birds use their beaks in getting food. The kingfishers with their powerful bills, perch on a tree branch near the water to catch fish. The pelicans use their large bills to catch fish. Other birds have small, short […]

What are some positive and negative effects of migration? Country losing people Advantages Disadvantages Decreases pressure on jobs and resources Gender imbalances are caused as it is typically men who seek to find employment elsewhere. Women and children are left Migrants may return with new skills ‘Brain drain’ if many skilled workers leave What are […]

What are the special features of desert plants? Features of Desert Plants Low Water Requirements. Desert plant survival depends on being able to exist on very little rainfall. Small or No Leaves. Moisture evaporates through leaves. Thorns. Many desert plants have needles or thorns. Ability to Quickly Absorb Water. What causes a desert to form? […]

Is freezing point depression positive or negative? The change in the freezing point is proportional to the amount of solute added. This phenomenon is called freezing point depression. The change in the freezing point is defined as: ∆Tf = Tf,solution − Tf,solvent. ∆Tf is negative because the temperature of the solution is lower than that […]

Which of the following factors does not affect the movement of ocean water? Which of the following factors does not affect the movement of ocean water? Temperature. Salinity. How temperature affects the movement of ocean water? Water expands when it warms up – heat energy makes its molecules move around more and take up more […]