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  1. Water rises to a height h in a capillary at the surface of earth. On the surface
  2. In radioactive element, β-rays are emitted from
  3. The electric field part of an electromagnetic wave in a medium is represented by
  4. The photoelectric threshold wevelength for potassium (work function being 2 eV) is
  5. In the reaction ₉₂U²³⁴→₈₇Y²²², how many α-particle and β-particles are emitted