Description : What is the photoelectric effect?
Last Answer : The photoelectric effect is the phenomenon by which electrons are emitted from a material when it absorbs electromagnetic radiation, such as light, and is an important concept in physics and quantum mechanics.
Last Answer : The photoelectric effect is the phenomenon in which electrons are emitted from a material when it is exposed to electromagnetic radiation, and is an important experimental result that provided evidence for the quantum nature of light.
Description : The ejection of electrons when a metal surface is irradiated is called (a) Black body radiation (b) Photoelectric effect (c) Zeeman effect (d) Atomic spectrum
Last Answer : Ans:(b)
Description : The Law of Photoelectric Effect was for- mulated by?
Last Answer : Albert Einstein
Description : For his explanation of Photoelectric Effect, he got Nobel prize for Physics in?
Last Answer : 1921
Description : Photoelectric Effect was explained by?
Description : Photoelectric Effect was proposed by?
Last Answer : Heinrich Hertz
Description : Quartz crystal in quartz watches work on the principle called? A. Photoelectric effect B. Stark effect C. Thermionic effect D. Piezo-electric effect (Answer) E. None of these
Last Answer : D. Piezo-electric effect (Answer)
Description : Can The photoelectric effect can only be explained by thinking of light as a stream of tiny packets of energy or as a?
Last Answer : Need answer
Description : In the photoelectric effect,what happens when light hits the metal?
Last Answer : electrons are knocked off atoms, causing electricity to flow
Description : Which of the following supports particle nature of photons? (1) Diffraction (2) Polarization (3) Photoelectric effect (4) Interference
Last Answer : (3) Photoelectric effect
Description : The reverse effect of X-ray emission is (1) Raman effect (2) Compton effect (3) Zeeman effect (4) Photoelectric
Last Answer : (4) Photoelectric Explanation: When fast moving electrons strike on high atomic weight substance, X - ray is produced. In contrast, Photoelectric effect takes place when radiation of sufficient frequency ... and electrons are emitted. Hence, X ray is the inverse phenomenon of photoelectric effect.
Description : For photoelectric effect to take place, the metal used as the cathode should have – (1) high melting point (2) low melting point (3) low work function (4) low resistance
Last Answer : (3) low work function Explanation: The photoelectric effect is the propensity of high-energy electromagnetic radiation to eject electrons from a given material. The photoelectric effect has been utilized in devices called photocells, consisting of two electrodes in a sealed vacuum tube.
Description : Solar cells work on the principle of – (1) photovoltaic effect (2) photoelectric effect (3) photoconductive effect (4) photosynthesis
Last Answer : (1) photovoltaic effect Explanation: Solar cells work on the principle of photovoltaic effect.
Description : Which phenomena shows the particle nature of light? (1) Diffraction (2) Interference (3) Photoelectric effect (4) Polarisation
Last Answer : (3) Photoelectric effect Explanation: The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
Description : Which one of the following phenomena can be studied with -rays a) Photoelectric effect b) Compton effect c) Pair production d) All of the above
Last Answer : a) Photoelectric effect
Description : Photoelectric effect was discovered by a) Einstein b) G.P.Thomson c) Hallwachs d) Lenard
Last Answer : a) Einstein
Description : The wave nature of light is demonstrated by which of the following? A. The photoelectric effect B. Color C. The speed of light D. Diffraction
Last Answer : D. Diffraction
Description : The particle nature of light is demonstrated by which of the following? w) the photoelectric effect x) the various colors of light y) the speed of light z) diffraction.
Last Answer : ANSWER: W -- THE PHOTOELECTRIC EFFECT
Description : What important property of light is demonstrated by the photoelectric effect?
Last Answer : ANSWER: PARTICLE NATURE OF LIGHT
Description : Albert Einstein received the Nobel prize in physics for his work on: w) gravitation x) relativity y) photoelectric effect z) Brownian motion
Last Answer : ANSWER: Y -- PHOTOELECTRIC EFFECT
Description : The photoelectric effect is a demonstration of: w) the wave nature of light x) the particle nature of light y) Compton scattering z) the continuous spectrum of radiation
Last Answer : ANSWER: X -- THE PARTICLE NATURE OF LIGHT
Description : Which of the following phenomena suggest that light may be a transverse wave? w) reflection x) polarization y) photoelectric effect z) diffraction
Last Answer : ANSWER: X -- POLARIZATION
Description : The wave nature of light is demonstrated by which of the following? w) the photoelectric effect x) color y) the speed of light z) diffraction
Last Answer : ANSWER: Z -- DIFFRACTION
Description : Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick
Last Answer : ANSWER: W -- EINSTEIN
Description : The reverse effect of X–ray emission is (1) Raman effect (2) Compton effect (3) Zeeman effect (4) Photoelectric
Last Answer : Photoelectric
Description : For photoelectric effect to take place, the metal used as the cathode should have______ (1) high melting point (2) low melting point (3) low work function (4) low resistance
Last Answer : low work function
Description : Which of the following supports particle nature of photons ? (1) Diffraction (2) Polarization (3) Photoelectric effect (4) Interference
Last Answer : Photoelectric effect
Description : Solar cells work on the principle of (1) photovoltaic effect (2) photoelectric effect (3) photoconductive effect (4) photosynthesis
Last Answer : photovoltaic effect
Description : State any four characteristics of photoelectric effect.
Last Answer : i) A metal emits electrons only when the incident (light) radiation has frequency greater than critical frequency (υ0) called threshold frequency. Threshold frequency different for different ... photoelectrons from the photocathode is independent of its Temperature. vi) The process is instantaneous
Description : What are the features of photoelectric action ?
Last Answer : 1. Photoelectric action is an instantaneous event. There is no black delay between the incident of light on the metal surface and the emission of electrons from it. No matter the intensity of the ... then no electrons are emitted from that metal. This is called metal starting frequency , fo .
Description : What is photoelectric action ?
Last Answer : Electrons are emitted when a light ray of suitable high frequency is incident on a metal surface , this phenomenon is called photoelectric action or photoelectric action.
Description : Save Money Using Photoelectric Smoke Alarms?
Last Answer : One of the biggest expenses with maintaining smoke alarms is the cost of batteries. Since you don't want to let the batteries go for too long, you need to constantly cycle them out about every six ... run off of a small photovoltaic cell that comes with them, meaning you never need to use batteries.
Description : What is the difference between regular smoke alarms and photoelectric smoke alarms?
Last Answer : Photoelectric smoke alarms are also called optical alarms. They are more expensive than regular alarms. They are also more accurate and less likely to go off unnecessarily.
Description : What is Einstein's photoelectric equation?
Last Answer : E(photon energy)=K.E+Work Function
Description : A photoelectric cell converts – (1) Mechanical energy to electric energy (2) Heat energy to mechanical energy (3) Light energy to chemical energy (4) Light energy to electrical energy
Last Answer : (4) Light energy to electrical energy Explanation: Photoelectric cell or photocell, device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident ... The most common type consists of two electrodes separated by a light-sensitive semiconductor material.
Description : The source of the sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission
Last Answer : (3) Nuclear fusion Explanation: The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, ... thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
Description : The source of the Sun's energy is the process of – (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission
Last Answer : (3) Nuclear fusion Explanation: Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter ... fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars.
Description : The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission
Last Answer : Answer: D
Description : Photoelectric cell converts
Last Answer : Light energy into Electric energy.
Description : Why can caesium be used in photoelectric cell while lithium cannot ?
Last Answer : Ans. Caesium has the lowest while lithium has the highest ionization enthalpy. Hence Cs can lose electrons very easily while lithium cannot.
Description : Why are potassium and caesium, rather than lithium used in photoelectric cells ?
Last Answer : Ans. Potassium and caesium have much lower ionization enthalpy than that of lithium. As a result, these metals on exposure to light, easily emit electrons but lithium does not. Therefore, K and Cs rather than Li are used in photoelectric cells
Description : What are the two main tools for collecting solar energy? a. Photoelectric panels and energy crops. b. Genetic engineering and internet. c. Both a. and b. d. None of the above.
Last Answer : a. Photoelectric panels and energy crops.
Description : ROM is composed of 1) Magnetic cores 2) Micro-processors 3) Photoelectric cells 4) Floppy disks
Last Answer : 2) Micro-processors
Description : PEG stands for ............... A) Joint Photo Experts Group B) Joint Photogenic Experts Group C) Joint Photographic Experts Group D) Joint Photoelectric Experts Group
Last Answer : C) Joint Photographic Experts Group
Description : Light waves can cause photoelectric emission in a) Metals b) Alkali metals c) Insulators d) None of the above
Last Answer : c) Insulators
Description : Why are Cs and K used as electrodes in photoelectric cells?
Last Answer : The alkali metal atoms have the largest sizes in a particular period of the periodic table. With This property makes caesium and potassium useful as electrodes in photoelectric cells.
Description : Photoelectric electricity is produced directly from solar energy when which of the following are absorbed in a semiconductor to create an electric current? w) protons x) electrons y) neutrons z) photons
Last Answer : ANSWER: Z -- PHOTONS
Description : The source of the Sun’s energy is the process of (1) Photoelectric emission (2) Nuclear fission (3) Nuclear fusion (4) Thermionic emission
Last Answer : Nuclear fusion