Calculate the de Broglie wavelengths of the following objects and discuss the relevance of quantum mechanics in describing their behaviour: (a). a dust particle of mass 1013 g, which is travelling at a velocity of 1 nm/s, (b). a 1.5 kg football travelling at 40 km/hr, (c). a neutron moving at 100 m/s.

Calculate the de Broglie wavelengths of the following objects and discuss the relevance of quantum mechanics in describing their behaviour: (a). a dust particle of mass 1013 g, which is travelling at a velocity of 1 nm/s, (b). a 1.5 kg football travelling at 40 km/hr, (c). a neutron moving at 100 m/s.

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