A popular kitchen appliance produces electromagnetic radiation with a frequency of 2450 MHz. With reference to Figure 6.4, answer the following: (d) Which of the following is the appliance likely to be? (i) A toaster oven, (ii) A microwave oven, or (iii) An electric hotplate.

Key Concepts

Electromagnetic Radiation

Electromagnetic radiation refers to waves of energy that travel through space at the speed of light. It encompasses a range of frequencies and wavelengths, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The frequency of the radiation determines its type and properties, with microwaves typically ranging from 300 MHz to 300 GHz.

Microwave Frequency

Microwaves are a specific type of electromagnetic radiation characterized by their frequency range, which is generally between 300 MHz and 300 GHz. The frequency of 2450 MHz falls within this range, making it suitable for applications like microwave ovens, which utilize this frequency to excite water molecules in food, generating heat and cooking the food efficiently.

Appliance Functionality

Different kitchen appliances operate based on distinct principles and energy sources. A toaster oven uses radiant heat to cook food, an electric hotplate uses direct electric heating, while a microwave oven uses electromagnetic radiation to heat food. Understanding the operational principles of these appliances helps in identifying which one corresponds to the given frequency of 2450 MHz.