Radioactivity And The Nuclear Atom

This topic covers “Radioactivity and the nuclear atom” of O Level Physics. (Equivalent to American high school diploma) If this is too basic for you, you can try the more advanced version here. Sub-Topics: Atom Nucleus Electrons Proton Number And Nucleon Number Nuclide Isotopes Radioactivity Radiation Detectors Randomness of Radioactive Emissions Characteristics of Three Types of Emission Deflection of Radioactive Particles …

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Barometer & Atmospheric Pressure

Atmospheric Pressure Air is a fluid. We are living at the bottom of a “sea” of air called the atmosphere. The weight of the Earth’s atmosphere pushing down on each unit area of Earth’s surface constitutes the atmospheric pressure. Origin of Atmospheric Pressure Atmospheric pressure exists because of molecular bombardment by energetic air molecules. Under normal conditions, there is a …

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Hydrostatic Pressure

Liquids and gases are called fluids, as they can change their shapes easily. A fluid is a substance that can flow. In the figure above, we notice that the water from the right container is going further than the water from the left container. The only difference between the two container is the height of the water column. Hence, we …

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Measurement Of Time

SI unit of time is second (s). It is a scalar quantity. The standard for unit of time, the second (s), is the exact duration of 9,192,631,770 cycles of the radiation associated with the transition between the two hyperfine levels of the ground state of cesium-133 atom. Some of the more common clocks and watches can be found in the …

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Measurement Of Length

SI unit for length is metre (m). It is a scalar quantity. Things you need to know: Accuracy refers to the maximum error encountered when a particular observation is made. Error in measurement is normally one-half the magnitude of the smallest scale reading. Because one has to align one end of the rule or device to the starting point of …

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Scalar and vector quantities

Scalar quantities are quantities in which the magnitude is stated, but the direction is either not applicable or not specified. Examples: Length Volume Mass Speed Vector quantities are quantities in which both the magnitude and the direction must be stated. Examples: Force Velocity Displacement Acceleration It does not make sense to say that you’re applying a force of 10 N …

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