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  1. Vectors A⃗, B⃗ and C⃗ are such that A⃗ . B⃗ = 0 and A⃗ . C⃗ = 0 Then the vector parallel
  2. A siren emitting sound of frequency 800 Hz is going away from a static listener
  3. If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
  4. Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state
  5. A body, which emits radiations of all possible wavelengths, is known as