Chapter 5, Problem 5.131MP

Interpretation Introduction

Interpretation:

The number of photons necessary to raise the temperature of a 350 mL cup of water from 20?C to 95?C needs to be determined. If

• Wavelength = 15.0 cm (used in a microwave oven to irradiate the food)
• The heat needed to raise the temperature of 1.00 g of water by 1.00?C = 4.184

Concept introduction:

Electromagnetic radiation can be defined as the waves of the electromagnetic field which can propagate through space and carries electromagnetic radiant energy. Radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays are some common examples of electromagnetic radiation. The relation between the wavelength, energy, and frequency of the electromagnetic radiations is as given below:

$\begin{array}{l}\text{E = hν = }\frac{\text{hc}}{\text{λ}}\\ \text{Here:}\\ \text{ν = frequency}\\ \text{c = speed of light }\\ \text{λ = wavelength}\\ \text{h= Planck's constant }\\ \text{E = energy}\end{array}$