Which observations and theories support the wave nature of light?
- Christiaan Hygens work on refraction and reflection
- Thomas Young used a screen with two slits to test the reflections of light and saw many lines reflected,
supporting the idea that light is made of waves.
- James Clerk Maxwell's theory of electromagnetic radiation.s
Which observations and/or theories support the particle nature of light?
- Newton's law of motion (light was streams of extremely tiny particles traveling at high speeds according to his
laws of motion)
- photoelectric effect
- blackbody radiation
,What is the wavelength of microwave radiation with a frequency of 450 MHz?
Equation:
Equation with values substituted:
Answer (with correct units and to 3 significant figures):
λ = C/V
450 MHz -> Hz = 450 x 1 x 10 ^6Hz = 4.5 x 10^8
λ = 2.998 x 10^8m/s / 4.5 x 10^8
λ=0.6662
, What is the energy of a photon being emitted by a radio wave that has a wavelength of 180 m?
Equation:
Equation with values substituted:
Answer (with correct units and to 3 significant figures):
E = hc/λ
E = (6.626 x 10^-34js)(2.998 x 10^8m/s) / 180m
E = 1.10 x 10^-26j
What are the main features from Bohr's model of the hydrogen atom that apply to all models used to describe the
distribution of electrons in an atom?
- The energies of electrons (energy levels) in an atom are quantized.
- An electron's energy increases with increasing distance from the nucleus.
- The discrete energies of light emitted by elements in an excited state result from quantized electronic energies.
- Christiaan Hygens work on refraction and reflection
- Thomas Young used a screen with two slits to test the reflections of light and saw many lines reflected,
supporting the idea that light is made of waves.
- James Clerk Maxwell's theory of electromagnetic radiation.s
Which observations and/or theories support the particle nature of light?
- Newton's law of motion (light was streams of extremely tiny particles traveling at high speeds according to his
laws of motion)
- photoelectric effect
- blackbody radiation
,What is the wavelength of microwave radiation with a frequency of 450 MHz?
Equation:
Equation with values substituted:
Answer (with correct units and to 3 significant figures):
λ = C/V
450 MHz -> Hz = 450 x 1 x 10 ^6Hz = 4.5 x 10^8
λ = 2.998 x 10^8m/s / 4.5 x 10^8
λ=0.6662
, What is the energy of a photon being emitted by a radio wave that has a wavelength of 180 m?
Equation:
Equation with values substituted:
Answer (with correct units and to 3 significant figures):
E = hc/λ
E = (6.626 x 10^-34js)(2.998 x 10^8m/s) / 180m
E = 1.10 x 10^-26j
What are the main features from Bohr's model of the hydrogen atom that apply to all models used to describe the
distribution of electrons in an atom?
- The energies of electrons (energy levels) in an atom are quantized.
- An electron's energy increases with increasing distance from the nucleus.
- The discrete energies of light emitted by elements in an excited state result from quantized electronic energies.
