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 : Safety fuse wire used in domestic electrical appliances is made of metal of low (1) Resistance (2) Melting point (3) Specific gravity (4) Conductance
Last Answer : (2) Melting point Explanation: The fuse wire is based on the Joules law of heating which says that when the electric current is allowed to pass through a conductor, the conductor heats up and is ... . For this purpose the material used as fuse wire should have high resistance and low melting point.
Last Answer : Melting point
Description : A Fuse wire is characterized by – (1) High resistance and low melting point (2) High resistance and high melting point (3) Low resistance and high melting point (4) Low resistance and low melting point
Last Answer : (4) Low resistance and low melting point Explanation: A fuse is a type of low resistance resistor that acts as a sacrificial device to provide over current protection, of either the load or source ... melt if a current more than the safe current for the appliance starts flowing through the circuit.
Description : The nature of .fuse wire is – (1) high resistance and low melting point. (2) high resistance and high melting point. (3) low resistance and high melting point. (4) low resistance and low melting point.
Last Answer : (1) high resistance and low melting point. Explanation: A fuse or fusable link works by opening an electrical circuit when the current becomes too high. As the current increases, the temperature ... be connected in series with the appliance. Besides, it should have a comparatively high resistance.
Description : A Fuse wire is characterised by (1) High resistance and low melting point (2) High resistance and high melting point (3) Low resistance and high melting point (4) Low resistance and low melting point
Last Answer : Low resistance and low melting point
Description : The nature of fuse wire is (1) high resistance and low melting point. (2) high resistance and high melting point. (3) low resistance and high melting point. (4) low resistance and low melting point.
Last Answer : high resistance and low melting point.
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 : 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 : Solar cells work on the principle of (1) photovoltaic effect (2) photoelectric effect (3) photoconductive effect (4) photosynthesis
Last Answer : photovoltaic effect
Description : In the photoelectric effect,what happens when light hits the metal?
Last Answer : electrons are knocked off atoms, causing electricity to flow
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)
Last Answer : Oscillators have Positive feedback.
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 : 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 : 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 : 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 : The reverse effect of X–ray emission is (1) Raman effect (2) Compton effect (3) Zeeman effect (4) Photoelectric
Last Answer : Photoelectric
Description : Which of the following supports particle nature of photons ? (1) Diffraction (2) Polarization (3) Photoelectric effect (4) Interference
Last Answer : Photoelectric effect
Description : Nichrome wire is used in an electric heater because _______. (1) It has high resistance (2) It has high melting point (3) It can resist a current upto approx 5 amperes (4) For all of the above reasons
Last Answer : (4) For all of the above reasons
Description : In arc welding, Argon is used because of its - (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value
Last Answer : (1) Low reactivity with metal Explanation: In arc welding, Argon is used as a shielding gas because it is chemically inert and forms no compounds. At the high temperatures that welding requires, the ... to brittle welds and instability in the welding arc. So,argon and other inert gases are sprayed.
Description : In arc welding, Argon is used because of its (1) Low reactivity with metal (2) Ability to lower the melting point of the metal (3) High flammability (4) High calorific value
Last Answer : Low reactivity with metal
Description : The material used for fuse must have (a) low melting point and high specific resistance (b) low melting point and -low specific resistance (c) high melting point and low specific resistance (d) low melting point and any specific resistance
Last Answer : (a) low melting point and high specific resistance
Description : A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the ... Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions
Last Answer : ANSWER: Z -- POSITIVELY CHARGED NEON IONS
Description : Cathode rays when obstructed by metal cause emission of - (1) γ – ray (2) X – ray (3) α – ray (4) β – ray
Last Answer : B. X – ray
Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity
Last Answer : ANSWER: Y -- HIGH MELTING POINT
Description : Which of the following is a low melting point metal? (A) Stainless steel (B) Wrought iron (C) Tin (D) Copper
Last Answer : (C) Tin
Description : Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process? (A) Galvanising (B) Tinning (C) Sherardizing (D) None of these
Last Answer : (C) Sherardizing
Description : Which of the following is not property of sodium metal? a) lustre b)hard c)low melting point d)solid at room temperature.
Last Answer : c)low melting point
Description : The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they (a) have smaller current passing through them (b) have very low resistance (c) have higher melting point (d) are made of black iron
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 : Ceramic nuclear metals compared to solid nuclear metals have (A) Higher melting points (B) Low strength at high temperature (C) More chances of radiation damage (D) Poorer corrosion resistance
Last Answer : (A) Higher melting points
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 a phenomenon in which electrons are emitted from a material when it is exposed to electromagnetic radiation, such as light, and was one of the key pieces of evidence supporting the theory of 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 : 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 : 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 : 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 : 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 : 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