Question

What is the momentum of a photon with a de Broglie wavelength of 5.4 m? Estimate h as 6.63 × 10-34J s and keep 3 significant figures. a)1.01 × 10-34 kg∙m/s b)1.23 × 10-34 kg∙m/s c)1.23 × 10-35 kg∙m/s d)1.45 × 10-34 kg∙m/s

Answer 1

Answer: a

Explanation: momentum = h / wavelength

Answer 2

Answer:

b)1.23 × 10-34 kg∙m/s

Explanation:

wavelength=5.4m

wavelength=h/momentum

5.4=6.63*10-34/momentum

therefore, momentum=6.63*10-34/5.4

                                     =1.227*10-34

                                     =1.23*10-34 kgm/s

                        therefore option b)1.23 × 10-34 kg∙m/s