CHM135H1 Lecture Notes - Lecture 1: Principal Quantum Number, Wave Equation, Isoelectronicity

Which of the following statements about the electromagnetic spectrum are true?

Choose all that are correct

1. X-rays are higher frequency than IR radiation

2. Blue light has a shorter wavelength than red light

3. UV photons have higher energy than IR photons

4. Almost all of the electromagnetic spectrum is visible to the human eye

5. Radio waves have frequencies smaller than microwaves

Electromagnetic radiation behaves both as particles (called photons) and as waves. Wavelength (λ) and frequency (ν) are related according to the equation

c=λ×ν

where c is the speed of light (3.00×108 m/s). The energy (E in joules) contained in one quantum of electromagnetic radiation is described by the equation

E=h×ν

where h is Planck's constant (6.626×10−34 J⋠s). Note that frequency has units of inverse seconds (s−1), which are more commonly expressed as hertz (Hz).

Part A

A microwave oven operates at 3.00 GHz . What is the wavelength of the radiation produced by this appliance?

Express the wavelength numerically in nanometers.