#Photoelectric Effect

(a) Describe the working principle of cellular networks. How do mobile devices maintain connectivity while moving between cells? (b) Using the photoelectric effect, explain the particle nature of electromagnetic radiation. How did experimental observations challenge Classical Wave Theory and lead to the development of quantum mechanics? (c) List the major social media platforms used for business and communication. How do they contribute to digital marketing? Explain. (d) Explain how the GPS system determines the position of a receiver using satellites.

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