ETEA RECONDUCTED PAPER 2023 RECONDUCTED ETEA 2023 ( PART 14 ) 1. A wave is characterized by three physical parameters Displacement, wavelength and speed of wave Amplitude, wavelength and acceleration Wavelength, frequency and speed of wave Frequency, wavelength and acceleration 2. Accelerating electromagnetic charges radiate electromagnetic waves which propagate at the Speed of light Frequency of electromagnetic waves Frequency of light Speed of electromagnetic waves 3. K-a rays are generated when transition of an electron occurs from: L to K shell L to M shell M to L shell K to M shell 4. The decay constant of sodium (Na) is 0.000128 /s. the half-life of sodium is 5 hours 900 s 3600 s 15 hours 5. At the end of 14 min, 1/16 of a sample of radioactive polonium remains. The corresponding half life is (7/4) min (7/8) min (7/2) min (8/7) min 6. According to Bohr’s model of the hydrogen atom, electrons move in specific orbit around the nucleus called Shell Clouds Wavelength Quanta 7. According to first law of thermodynamics. What is the relationship between the change in the internal energy of a closed system ΔU, the heat added to the system (Q) and the work done by the system (W) ΔU = Q – W ΔU = Q + W ΔU = Q ×W ΔU = Q/W 8. Angular displacement is measured in Revolution All of these Radius Degrees 9. Centrifugal force m^2v/r mv/r^2 mv2/r mv^2/r 10. Circular periodic waves can be generated In a ripple tank using spherical dippers By giving sudden up and down movement to a rope with one fixed end All of them Using electromagnetic vibrator Loading … Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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