Which puts out the greater percentage of its energy as light, an incandescent lamp or a mercury vapor lamp?

Q: If energy is radiated by all objects, why can we not see themin the dark?

A: energy is radiated

Q: A laboratory laser has a power of only 0.8 m W, 8 × 10−4 W. Why does it seem more powerful than…

A: Lasers are coherent, highly monochromatic and is generally focused in a single direction. Lasers…

Q: The paint used to make lines on roads must reflect enough light to be clearly visible at night. Let…

A: (a) The degree of freedom =n-1=19-1=18 It is a right-tailed test. So the p-value= P(t with df=18…

Q: not an application of photoelec O a. in chromatiser O b. in television camera O c. in solar…

A: Option a ) Chromatiser   Photoelectric effect s not used in chromatiser  In chromatiser adsorption…

Q: Why does the sky normally appear blue? * Light contains energy. When it hits a molecule, they…

A:

Q: What happens to an electron when a photon hits it?

A: As per Compton effect, when a photon strikes an electron at rest, some of its energy is lost to the…

Q: 11 11 11 11 11 11 11 %23

A:

Q: Why are LEDs the lamp of choice in hard to get to places such as high ceilings?

A: as compared to other type of lamps, led lamps hace high durability with  long life periods.…

Q: This is #4 on the worksheet. How much energy will a 2.5 W laser use in 12 seconds? Your answer: O…

A:

Q: 10 3| = 13.8 0.1 25.0 20 30 120 사리 =D 11.0 10 -10 7 = 5.0 Id| = 11.0

A: As per guideline we are suppose to do only 3 subpart from multipart question.

Q: Since energy is radiated by all objects, why can't we see them in dark?

A: Radiation emitted from all the objects doesn’t have the same wavelength. A normal human eye can…

Q: How do fluorescent soap residues make clothing look “brighter and whiter” in outdoor light? Would…

A: Outdoor light is mainly the sunlight coming from the sun. When the fluorescent soap residues expose…

Q: The purpose of choke in tube light is?

A: When the switch is ON, in a tube light choke is nothing but the coil/ballast ( inductor) which is…

Q: What is the principle of corresponding states?

A:

Q: 10Ω 20 Ω 4ν 3ν 2A Β 15Ω 25Ω Ε 6V

A: E= 135 Volt

Q: what occurs when outer electrons that buzz about the atomic nucleus encounter electromagetic waves?

A: When an electromagnetic wave is incident on the outermost electron or loosely bound electron of an…

Q: When ultraviolet light falls on certain dyes, visible light is emitted. Why does this not happen…

A: Given: When ultraviolet light falls on certain dyes, visible light is emitted. Why does this not…

Q: which photons would create 3.5 volts in a solar cell?

A: The photons carries some energy. When photons are absorbed, they hit the electrons and transfer…

Q: -0.1489 2 9.8ms 2 (Vocos (49.39°)) ²

A: The given equation                       -0.1489 = 9.8m/s22vocos49.39°2 Here vo can be computed from…

Q: Why led bulb best than CFL?

A: CFL or Compact fluorescent lamps were used in place of tungsten bulbs for long time. They work by…

Q: In the figure below, what kind of bias? And when does the lamp go out? discuss..

A:

Q: Plot the forward characteristics of each LED (each color) on the same graph.

A:

Q: Why is infrared spectrophotometry a good method for identifying a pure chemical substance, whereas…

A: Infrared spectrophotometry a good method for identifying a pure chemical substance cause,

Q: Have you ever watched a fire and noticed that the burning of various materials often produces flames…

A: The color of the flame depends on several factors, and the most important among them are black body…

Q: what role does openness to new ideas play in the development of the concept of atom?

A: The ancient Greek philosophers Democritus and Leucippus recorded the concept of the atomo, an…

Q: Which one of the following is a unique property of LASER Select one: O a. Monochromaticity b.…

A: Which one of the following is a unique property of LASER

Q: How does the lifetime of a typical CFL compare with that of an incandescent bulb?

A: The compact fluorescent lamps are more efficient than incandescent lamps. They put about four times…

Q: Does atomic excitation occur in solids as well as in gases? How does the radiant energy from an…

A: Radiant energy is the form of energy that emits in the form of electromagnetic waves. The various…

Q: What is the principle of LED?

A: A light-emitting diode has a two-lead semiconductor light source. It is a p–n junction diode.

Q: Elements at the Sun's surface are revealed in the solar spectrum. Are the lines in the spectrum…

A: Elements of the Sun’s surface are revealed in the solar spectrum.

Q: How is the energy of a photon related to its vibrational frequency?

A: The energy of a photon is given by

Q: Distinguish between fluorescence and phosphorescence.

A: Explanation:

Q: The radiation emitted from a small hole in a furnace is a. microwave. b. x-ray. c. infrared. d.…

A: Black Body Radiation: The black body is theoretically an ideal body that is supposed to receive all…

Q: When ultraviolet light shines on glass, what does it do to electrons in the glass structure?

A: Ultraviolet light is the light having wavelength less than the violet color's wavelength. It has…

Q: A silicon atom is more massive than a sodium atom. Why then is a sodium atom larger in size?

A: Step 1Across the periodic table, there is a simple trend that from left to right the size of an atom…

Q: Why are LEDs the lamps of choice in hard -to-get-to places, such as high ceilings?

A: LEDs stand for Light-emitting diodes. In LEDs, none of the components consists of glass.

Q: We can heat a piece of metal to red-hot and then to white-hot. Can we heat it until the metal glows…

A: Yes, metal can glow blue- hot as temperature of metal increases.

Q: 192 H7/k6 No Fit O Clearance Fit O Transition fit O Interference Fit

A: 192 H7/k6 is an example of transition fit. It is used in gear, wheels, clutches and brakes.

Q: What are the benefits of ultraviolet rays?

A: Ultraviolet rays are a form of electromagnetic radiation. Ultraviolet Light refers to the region of…

Q: When a gas glows, discrete colors are emitted. When a solid glows, the colors are smudged. Why?

A: Different colors are observed when a gas glows since the colors come from electrons jumping down…