available across the visible‚ ultraviolet‚ and infrared wavelengths‚ with very high brightness. When a light-emitting diode is switched on‚ electrons are able to recombine with holes within the device‚ releasing energy in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. A LED is often small in area (less than 1 mm2)‚ and integrated optical components may be
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Plasma Complexity! Plasma is said to a substance similar to gas in which a certain portion of the particles are ionized. The basic premise is that heating a gas dissociates its molecular bonds‚ rendering it into its constituent atoms. Further heating leads ionization‚ turning it into plasma: containing charged particles‚ positive ions and negative electrons. The presence of a non-negligible number of charge carriers makes the plasma electrically conductive so that it responds strongly to electromagnetic
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cigarettes‚ primarily industrially manufactured but also hand-rolled from loose tobacco and rolling paper. Today we are more aware about how bad smoking is for our health. Smoking should be banned or restricted in almost all public places because it has been shown to be dangerous to health‚ it can reduced athletic performance and it can lead to bad skin‚ bad breath and bad-smelling clothes and hair. The arguments against smoking are well known. Smoking has been shown to be dangerous to health. Heart
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Approximation of Planck’s constant and work function using Photoelectric effect on the particle nature of light Abstract This experiment aims to demonstrate the particle nature of light by photoelectric effect. Stopping potential was measured against different intensities of yellow (λ = 578 nm) and green (λ = 546 nm) light from first order spectral lines of mercury. No significant relationship was observed for stopping potential and percent transmission. However‚ charging
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1. A single disturbance that moves from point to point through a medium is called a ___. a. period b. periodic wave c. wavelength d. pulse Answer: D A wave is a continuous and repeating disturbance of a medium and a pulse is a single disturbance. 2. If the particles of the medium are vibrating to and fro in the same direction of energy transport‚ then the wave is a ____ wave. a. longitudinal b. sound c. standing d. transverse Answer: A In longitudinal waves‚ particles of the medium
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EXPERIMENT NO-1 AIM- To determine the frequency of A. C. mains by using an electric vibrator. APPARATUS- Electric vibrator‚ table lamp‚ pulley‚ weight box‚ fishing cord‚ a. c. source. THEORY- when a cord of mass per unit length m is connected to the vibrating rod of the vibrator and stretched with a tension T‚ the cord vibrators in segments. If the length of the cord is then adjusted until the nodes are clearly marked‚ the frequency of the stretched string is the same as of the vibrating rod which
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The Physics of Balls Bouncing off at Surfaces Leader: Mr. Edrian Pantas Contador‚ Love S. Members: Espiritu‚ Ian Timothy Ecube‚ Lynn Kristine Magangcong‚ Ahlya Oliman‚ Genie Rose Chapter 1 Introduction Bouncing ball physics is an interesting subject of analysis‚ demonstrating several interesting dynamics principle related to acceleration. Almost everybody‚ at some point in their lives‚ has bounced a rubber ball against the wall or floor and observed its motion. Normally
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mass that is gained or lost by the system will cause a change in momentum that is not the result of an external force. A different equation is necessary for variable-mass systems (see below). Newton’s second law requires modification if the effects of special relativity are to be taken into account‚ because at high speeds the approximation that momentum is the product of rest mass and velocity is not accurate. Newton’s second law states that an object will change acceleration if pushed or
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mass and will therefore slide twice as far before stopping. 2)A bird is standing in a bird cage‚ which is itself resting on an electronic balance. The bird flaps its wings and starts to fly upwards while remaining in the cage. Neglecting any effects from the turbulence of the air created by the flying bird‚ will the mass reading of the
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integral part of our lives. This issue that “TV has bad effects on children “is a controversial one and can be approached from different angles due to its complexity; but in my opinion‚ a closer examination reveals that new generation is growing up addicted to the TV as it has never been truer than it is today . Especially‚ it has very bad effects on children. We can consider negative effects of TV on children in many aspects. First of all‚ it is bad for their health; second‚ it is harmful for their
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