Category: Physics

What is emission spectra and its types? Each source has its own characteristic emission spectrum. The emission spectrum can be divided into three types: (i) Continuous emission spectra (or continuous spectra) if the light from incandescent lamp (filament bulb ) is allowed to pass through prism (simplest spectroscope ), it splits into seven colours. What […]

How do you calculate precision? Precision is a metric that quantifies the number of correct positive predictions made. Precision, therefore, calculates the accuracy for the minority class. It is calculated as the ratio of correctly predicted positive examples divided by the total number of positive examples that were predicted. How do you find percent accuracy? […]

What are the examples of divergent boundaries? Examples Mid-Atlantic Ridge. Red Sea Rift. Baikal Rift Zone. East African Rift. East Pacific Rise. Gakkel Ridge. Galapagos Rise. Explorer Ridge. What are the example of divergent boundary? An example of a divergent boundary is the mid Atlantic Ridge (there are mid ocean ridges in the Indian, and […]

How much energy does it take to boil 100 mls of water if room temperature is 20c? From the steam tables, the heat capacity is close to 2 KJ/kg/deg C, far from 1.2 that you used, so it takes around 160 KJ to heat a kg of water to 100 C, from 20 C. This […]

How many Earth years is a Lightyear? A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it! What is the oldest planet in the universe? At 12.7 billion years old, planet Psr B1620-26 B is […]

Why is derating necessary? Derating increases the margin of safety between part design limits and applied stresses, thereby providing extra protection for the part. By applying derating in an electrical or electronic component, its degradation rate is reduced. The reliability and life expectancy are improved. How do you calculate derating current? Selection of cable – […]

What is used to measure plate movement? – How do scientists measure the distance that plates move? – Scientists use GPS satellites and laser technology to measure the plates movements down to the centimeter. – Laser pulses are shot from the ground to a satellite to determine the exact location of the plates. What techniques […]

Where is gravity the strongest in the universe? The Sun What’s the strongest force in the universe? strong nuclear force What would your weight be on the moon? Your weight on the Moon is 16.5% what you would experience on Earth. In other words, if you weighed 100 kg on Earth, you would weigh a […]

What is the formula for change in internal energy? The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system. In equation form, the first law of thermodynamics is ΔU = Q − W. Here […]

Why does each element have a unique emission spectrum? As each element has different energy states available to it, each element releases photons of different color when its atoms return to their lower energy states. Since each atom has many excited states (high energy levels) available to it, several colors of light can be emitted […]