What is energy? What is work? List some examples of each.

Solution: Here, we are going to calculate the wavelength of the given radiation. Also, we are going to identify the appliance emitting the radiation. Step1: The distance between two adjacent crests or troughs is called wavelength. It is denoted by the o o -10 greek letter lambda() and is generally expressed in terms of Angstrom units(A ) [1 A = 10 m] On the other hand, the number of waves which pass through a given point in one second is known as the frequency. It is denoted by the greek letter nu() and is generally expressed in terms of Hertz(Hz) [1 Hz = 1 sec ] -1 If c is the velocity of light, the the relation between wavelength, frequency and velocity of light is given by: c = x ------(1) Step2: a) Given, frequency of the radiation = 2450 MHz 6 6 = 2450 x 10 Hz. [1 MHz = 10 Hz] = 2.450 x 10 sec . -1 [1 Hz = 1 sec ] -1 Speed of light (c) = 2.998 x 10 m/sec8 Therefore, from equation (1), wavelength() = c/ 8 9 -1 Substituting the values, we get, = (2