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MCQ's with answers on Planck constant topic of chemistry

It discusses 10 multiple choice questions with answers on Planck's constant concept.

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MCQ's with answers on Planck constant topic of chemistry

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  1. MCQ's with answers on Planck constant topic

  2. Q.1. Why did Planck’s constant introduce in the quantum equation? (a) Chemical equations must have a constant value (b) Planck felt to introduce it to have his name (c) It describes the photon energy from the frequency of light (d) A constant only can express the energy of light Answer: It describes the photon energy from the frequency of light Blog: https://jayamchemistrylearners.blogspot.com/

  3. Q.2. Planck’s constant is _________________ (a) Fundamental constant (b) Proportionality constant (c) Universal constant (d) All the above Answer: All the above Blog: https://jayamchemistrylearners.blogspot.com/

  4. Q.3. The Planck’s constant applies to______________ (a) Macroscopic objects (b) Microscopic particles (c) Both options (a) and (b) (d) Neither (a) nor (b) Answer: Microscopic particles Blog: https://jayamchemistrylearners.blogspot.com/

  5. Q.4. Unit of Planck’s constant in atomic units is _________________ (a) eV second (b) eV hertz (c) Joule / hertz (d) Joule second Answer: eV second Blog: https://jayamchemistrylearners.blogspot.com/

  6. Q.5. What is the value of Planck’s constant in CGS units? (a) 6.626 X 10-34 joule second (b) 6.626 X 10-27 erg second (c) 6.626 X 10-25 erg second (d) 6.023 X 10-23 erg/hertz Answer: 6.626 X 10-27 erg second Blog: https://jayamchemistrylearners.blogspot.com/

  7. Q.6. Planck’s constant explains______________ (a) Quantum nature of light (b) Particle nature of light (c) Wave nature of light Particle nature of light Discrete quantum of light (d) Both the options (a) and (b) Answer: Both the options (a) and (b) Blog: https://jayamchemistrylearners.blogspot.com/

  8. Q.7. What is the relationship between the magnitude of the photon’s energy and frequency? For a single photon (a) Varies directly (b) Varies inversely (c) Equal to each other For "n" no. of photons (d) 2π times the photon’s energy Answer: Varies directly Blog: https://jayamchemistrylearners.blogspot.com/

  9. Q.8. The light radiations with same energy have___________ (a) Same frequency Energy (b) Same wavelength Light beam (c) Same velocity (d) Same amplitude Answer: Same frequency Blog: https://jayamchemistrylearners.blogspot.com/

  10. Q.9. Which of the following experimental method used to determine Planck’s constant in laboratories? (a) Particle accelerator method (b) Ion exchange method (c) Vapor density method (d) Determination of the mass of the sample Answer: Particle accelerator method Blog: https://jayamchemistrylearners.blogspot.com/

  11. Q.10. Why are LED lights used to calculate Planck constant? (a) It is a reliable light source available at a cheaper cost (b) It emits light at specific wavelengths (c) It emits different colored radiations at different threshold voltages (d) It transfers electric energy to light radiation Answer: It emits different colored radiations at different threshold voltages Blog: https://jayamchemistrylearners.blogspot.com/

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