# The switch whether works or not has to be determined and explained when the light falling on the metal has a wavelength of 540 nm or more and the reason. Concept introduction: Electromagnetic radiations are a type of energy surrounding us. They are of different types like radio waves, IR, UV, X-ray etc. The violet and red light lies in the visible light where violet light is between 390 nm and 455 nm whereas red light is between 622 nm and 780 nm . Planck’s equation, E = hν where, E = energy h = Planck's constant ν = frequency The energy increases as the wavelength of the light decrease. Also the energy increases as the frequency of the light increases. The frequency of the light is inversely proportional to its wavelength. ν = c λ where, c = speed of light ν = frequency λ = wavelength Photoelectric effect: Electrons get ejected if a ray of light hits on the surface of metal when the light has adequately high frequency. A minimum frequency is required for the light to eject the electrons called threshold frequency

### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter 6, Problem 12PS
Interpretation Introduction

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