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Mdcat-past-papers Quiz

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1521. The experimental proof of particle nature of light is:



1522. If Rydberg constant for hydrogen is R_H then wavelength λ of first line in Lyman series is:



1523. The instantaneous emf generated by alternating current generator is written as:



1524. The minimum energy of photon required for pair production is:



1525. In which spectral series is the far ultraviolet region of electromagnetic spectrum found?



1526. Which of the following corresponds to the momentum of a photon?



1527. An atom makes a transition from a state of energy E₂ to one of lower energy E₁. Which of the following gives the wavelength of the radiation emitted, in terms of Planck's constant h and speed of light c?



1528. The energy of an X-ray photon having wavelength of 3 × 10⁻¹⁰ m is:



1529. "The speed of light in the vacuum is the same for all observers regardless of their relative motion or the motion of the source of the light" is the important postulate of:



1530. Red light is used in photographic dark room because of:



1531. Which is the correct 'ascending order' in which photons are arranged according to their energy?



1532. The wavelength associated with an electron is of the order of:



1533. Red light is used in photographic dark room because of:



1534. Which photons carry the most energy?



1535. Which X-ray photon will have the longest wavelength?



1536. Which of the following series lies in infra-red region?



1537. According to quantum theory, the radiation must appear in the form of:



1538. Gamma radiations are emitted due to:



1539. The least possible wavelength is associated with:



1540. Which radiations cannot be generated under electron transitions in different orbits?



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