1. The phenomenon of radioactivity was discovered by ________. A. Marie Curie B. Becquerel C. Thomson D. Bohr 2. What is the chemical symbol for gold? A. Ag B. Ge C. Fe D. Au Total Marks: 0
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1. The phenomenon of radioactivity was discovered by ________. A. Marie Curie B. Becquerel C. Thomson D. Bohr 2. What is the chemical symbol for gold? A. Ag B. Ge C. Fe D. Au 3. In which year J.J.Thomson discovered the electron? A. 1907 B. 1899 C. 1911 D. 1897 4. Who suggested first time model of atom ? A. Einstein B. Bohr C. Thomson D. Planck 5. What is the order in meter of the atomic radius ? A. 10 -10 B. 10 -12 C. 10 -15 D. 10 -20 6. What is the order of nucleus radius in meter? A. 10 -14 B. 10 -10 C. 10 -24 D. 10 -41 7. Which phenomenon of electron emission is not explained by the J.J.Thomson 1904 Atomic Model? A. Thermionic emission B. Photo-electric emission C. Ionization D. Emission of spectra 8. In which year α-particle scattering was observed by the Rutherford's experiment? A. 1906 B. 1904 C. 1897 D. 1911 9. In the Rutherford's α-particle scattering experiment
Davisson and Germer Experiment || Matter Waves -2023
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Davisson and Germer Experiment || Matter Waves -2023 : In the Davisson and Germer experiment, a beam of electrons was directed at a crystalline nickel target. The electrons were accelerated and had a significant amount of energy. When the high-energy electrons struck the crystal lattice of the nickel target, they interacted with the regularly spaced atoms in the lattice. This interaction resulted in the scattering of the electrons.