Name _________________________________

Block_______________

The speed of light is 3.00 x 10⁸ m/s and Plank’s constant is 6.63 x 10^-34 J-s. The equations you need are c = ln and E = hn

1. A Bunsen burner is lit. A student has sensory preceptors that allows them to feel the photons emitted by the flame with a wavelength of 2.0 x 10^-5 m. Find the A) frequency of these photons and B) the portion of the electromagnetic spectrum they are associated with.

2. Another photon is emitted by the flame has an energy of 4.23 x 10^-19 Joules. Find the A) frequency, B) wavelength in meters and nanometers, and C) the portion of the spectrum for this photon. How might you detect this photon?

3. Ultraviolet light causes a chemical reaction in your skin and darken the pigments in your skin. If the wavelength of these photons is 200. nanometers, find the A) wavelength in meters B) frequency C) energy of these photons.

4. Explain what the following statements mean.

A) The orbits occupied by electrons are quantized.

B) When at atom absorbs a photon it goes from the ground state to the excited state.

C) How does an atom create light.

D) What is a photon?

E) Atom emit line spectra.

F) Spectra of different elements are like fingerprints.

G) What is the electromagnetic spectrum.

H) Draw a picture of a wave and describe the terms, wavelength, frequency, speed, crest, and trough.

I) What is the difference between core electrons and valence electrons?

J) What happens to the potential energy of an electron as it moves from a low to a high energy level or orbital?

K) How is energy conserved when an atom emits light? How does this relate to kinetic energy and potential energy?

5. What is the underlying principle of quantum mechanics. Illustrate your answer using light and electrons as an example of quantum mechanics.

Here are some more problems.

6. An excited sodium atom emits light with a wavelength of 592 nm. Find the A) wavelength in meters, B) frequency, C) energy of this photon. What part of the electromagnetic spectrum would this photon fall into?

7. An excited H atom emits light with an energy of 1.63 x 10^-18 J. Find the A) frequency, B) wavelength of this photon. What part of the electromagnetic spectrum does this photon belong to?

8. Suppose an electron “drops” from the fourth to the second energy level of an atom. How would the energy of the photon released compare to the energy of a photon created when the electron dropped from the third to the first energy level? Explain.