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LED
Which of these lamps employs semiconductor technology?
Total internal reflection
What phenomenon is extensively used in fiber optics and many photonic devices?
Gamma rays
X-rays are similar to what type of radiation?
Shiny metals
Why are metals shiny?
Wave nature of light
What does Thomas Young's double slit experiment demonstrate?
White
If neon energy levels were not discrete, neon signs would glow what color?
Oscillating electric and magnetic fields
Electromagnetic waves consist of what fields?
Law of reflection
What is the law of reflection?
Particle theory of light
Did Einstein's photoelectric explanation support wave or particle theory?
Coherent photons
How do photons in a laser differ from those in an incandescent lamp?
Invisible
Most electromagnetic waves are what?
Phosphorescent
A watch dial glowing after a week is likely what?
Much faster
In air, radio waves travel how compared to sound?
Fluorescence vs. phosphorescence
What's the difference between fluorescence and phosphorescence?
Microwaves
Which photons have lower energy: microwaves or X-rays?
Two bands
If electrons behaved only like particles in a double slit, what would appear on the screen?
Both arrive at the same time
If light and radio signals left Alpha Centauri, which arrives first?
Alpha -2, Beta +1, Gamma 0
What change in atomic number occurs in alpha, beta, and gamma decay?
Visible light
Glass is transparent to what type of light?
E = h f
What equation relates photon energy to frequency?
Coherent light
How does coherent light differ from sunlight?
Phosphors emit visible light
What causes white light in fluorescent lamps?
Hot surfaces
A mirage occurs mostly over what kinds of road surfaces?
Radioactivity in Earth's interior
What is the main source of Earth's internal heat?
Lead
Natural uranium decays into what element?
Yes, due to potassium-40
Is the human body radioactive?
Light travels through vacuum
Why can we see stars at night?
Sound wave
Which wave cannot travel in a vacuum?
Highest frequency and energy
Rays with the shortest wavelength have what frequency and energy?
Red
Which color passes through red glass?
Yes, this is wrong
Which statement is WRONG: light travels as particles and hits like waves?
Electrons
Quantum uncertainties are only significant for what object?
Increases
What happens to light speed when moving from water into air?
Sound waves
Which is fundamentally different from the others: sound waves or EM waves?
Engineers, surgeons, mechanics, aviators
Optical fibers are used by which professions?
Polarization
What phenomenon distinguishes transverse waves from longitudinal waves?