Light and Quantum Mechanics Flashcards
What is focal length of a lens ?
Focal length of a lens : the distance from the lens at which incident parallel light rays would intersect
compared to visible light, x rays have what characteristics ?
X rays have have a higher frequency and energy per photon.
How do you compare sound waves and light waves when moving from air to water ?
Sound waves SPEED up when moving from air into water whereas light waves slow down
describe virtual image
It is located behind the reflecting surface of a mirror
What provides best evidence of light behaving as a particle ?
Photoelectric effect
Why does light bends toward the normal when it passes from air into water is:
because it slows down.
What is the unit of Planck’s constant ?
kg x m^2/s
What are the units for energy of photon
E= Joules= N x m = kg x m^2/s^2
What is Wave Rule #1 regarding speed of a wave and frequency ?
The speed of a wave depends on the medium and the type of wave and does NOT change with a change in frequency.
what is sin 60, 90 and 45 and 30
sin 30 : 1/2
sin 45: square root 2/2
sin 60 = square root 3/ 2
sin 90 = 1
What is cos 30, 45, 60 , 90
cos 0 : 1
cos 30 : square root 3/2
cos 45: square root 2/2
cos 60 : 1/2
cos 90 : 0
does water or air have greater index of refraction ?
WATER has a GREATER index of refraction that air
What is the period of a spring system ?
period of a spring system: T = 2π√( m / k
What is the Heisenberg uncertainty principle rule?
Heisenberg Uncertainty Principle: deltax x deltap greater than or equal to h/2 pi
the uncertainty of position x uncertainty of momentum is greater than nor equal to Planck’s constant /2 pi
What is the relationship between speed of light and color change ?
Light will always travel at the SAME speed in a vacuum, regardless of color.
changing frequency, wavelength, or intensity will not change the speed of the light.
compare the wavelengths of IR (infrared ) light, Visible light and Ultraviolet light
Infrared light has LONGER wavelength than visible light and that ultraviolet light has a shorter wavelength than visible light
(UV < Visible light< IR) for increasing wavelength
(if you have longer wavelength, have lower frequency)
what type of lens is used for person with hyperopia ?
A hyperopic person is farsighted (cannot see things closely) . this is because the focal length is too long. This means that the image focuses behind the retina.
The type of lens that would be corrective for this person would be a CONVEX lens that CONVERGES light
What is the correct lens to use for person with myopia ?
Myopia : nearsighted (cannot see things far away)
- focal length too short
-need Diverging lens
- image to be formed in front of the retina.
To“correct” the problem of the CONCAVE lens could be used
What are characteristics of lasers ?
The light emitted by a laser is only of ONE color.
There is constructive interference between the waves emitted.
describe relationship between wavelength and index of refraction
Longer the wavelength, the LOWER the index of refraction
