photoelectric effect pyqs - Copy.pdf
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This document contains 4 multiple choice questions related to the photoelectric effect: 1) The first question asks what the new stopping potential will be if the distance between the light source and photo cell is halved. The answer is that the stopping potential will be doubled. 2) The second question asks what the photoelectric current will be if the light frequency is halved and intensity is doubled. The answer is that the current will be halved. 3) The third question asks for the longest wavelength of light that can cause photon emission from a material with a work function of 4.0 eV. The answer is 966 nm. 4) The fourth question uses Einstein's photoelectric equation to solve
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Film vocab for eal 3 students: Australia the movie
Film vocab for eal 3 students: Australia the movie
Mule event processing models | MuleSoft Mysore Meetup #47
Mule event processing models | MuleSoft Mysore Meetup #47
photoelectric effect pyqs - Copy.pdf
- 1. ' Experimental Study of Photoelectric Effect 0. A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0• Ifthe distance between the light source and photo cell is made 25 cm, the new stopping potential will be: (a) V0/2 (b) V0 (c) 4V0 (d) 2V0 (Karnataka NEET 2013) 1. Photoelectric emission occurs only when the
- 2. . Light offrequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled? (a) Doubled (b) Four times (c) One-fourth (d) Zero (NEET 2020)
- 3. :J Einstein's Photoelectric Equation : Energy Quantum of Radiation The work function of a photosensitive material .s 4.0 eV. The longest wavelength of light that can :ause photon emission from the substance is :approximately) :a) 3100 nm :c) 31 nm (b) 966 nm (d) 310 nm (Odisha NEET 2019)
- 4. ' L. .I., ~- (a, d): The maximum kinetic energy is give1 he he K =hu-lh0 =hu-hu0 =--- max 'I' A A 0 here A0 =threshold wavelength 1 2 he he r -mv -- 2 A A 0 ere, h =4.14 x 10-15 eV s, c =3 x 108 m s-1 An= 3250 X 10-10 m = 3250 A
- 5. ). (b) : According to Einstein's photoelectric equation, eV =he_ he s A Ao h h As per question, eV = ; - ~ ...(i) eV he he = - - - 4 2A Ao ...(ii) ~ om equations (i) and (ii), we get he he he he - - - = - - - 2A 4A Ao 4A