Light passing through a double-slit arrangement is viewed on a distant screen. The interference pattern observed on the screen would have the widest spaced fringes for the case of
red light and a small slit spacing
Light from a green laser of wavelength 530 nm passes through two slits that are 400 nm apart. The resulting pattern formed on a screen in front of the slits is shown. If point A is the same distance from both slits, how much closer is point B to one slit
530 nm
The colors in a rainbow are caused by
different amounts of refraction for light of different colors by the water in the raindrops
A double-split experiment yields an interference pattern due to the path length difference from light traveling through one slit versus the other. Why does a single slit show a diffraction pattern?
There is a path length difference from waves originating at different parts of the slit
If you hold two fingers very close together and look at a bright light, you see lines between the fingers. What is happening?
you are seeing a diffraction pattern
Light passes through a slit that is about 5x10^-3m high and 5x10^-7m wide. The central bright light visible on a distant screen will be
about 5x10^-3m high and wider than 5x10^-7m
Blue light of a wavelength x passes through a single slit of width d and forms a diffraction pattern on a screen. If we replace the blue light by red light of wavelength 2x, we can retain the original diffraction pattern if we change the slit width
not at all
Imagine holding a circular disk in a beam of monochromatic light. If diffraction occurs at the edge of the disk, the center of the shadow is
a bright spot
If someone is around a corner from you, what is the main reason you can hear them speaking but can't see him?
sound waves have long enough wavelengths to bend around a corner; light wavelengths are too short to bend much.
When a CD is held at an angle, the reflected light contains many colors. What causes these colors?
Light reflected from the closely spaced grooves adds constructively for different wavelengths at different angles
If a thin film has thickness that is_____
none
If unpolarized light is incident from the left on three polarizers, in which case will some light get through
Case two only
The image of a nearby object formed by a camera lens is
farther from the lens than the lens' focal point
What is a megapixel in a digital camera?
a million light-sensitive spots on the detector
When a nearsighted person looks at a distant object through her glasses, the image produced by the glasses should be
at her eye's far poiint
If the distance from your eye's lens to the retina is shorter than for a normal eye, you will struggle to see objects that are
nearby
The image produced on the retina of the eye is______ compared to the object being viewed
inverted
How do eyeglasses help a nearsighted person see more clearly?
Diverging lenses bend light entering the eye, so the image focuses farther from the front of the eye.
When you closely examine an object through a magnifying glass, the magnifying glass
makes the object appear farther than it actually is
It would be impossible to build a microscope that could use visible light to see the molecular structure of a crystal because
diffraction limits the resolving power to about the size of the wavelength of the light used
Why aren't white light microscopes made with a magnification of 3000x
lenses can't be made with short enough focal lengths
The resolving power of a microscope is greatest when the object being observed is illuminated by
ultraviolet light
Which of the following statements is true?
A larger-diameter lens can better resolve two distant points
While you are photographing a dog, it begins to move away. What must you do to keep it in focus?
move the lens closer to the sensor or film
A converging lens, like the type used in a magnifying glass,
can also produce an image smaller than the object and can also produce an inverted image (upside down)
The fictional rocket ship Adventure is measured to be 50 m long by the ship's captain inside the rocket. When the rocket moves past a space dock at 0.5c, space-dock personnel measure the rocket ship to be 43.3 mm long. What is its proper length?
50m
As rocket ship Adventure passes by the space dock, the ship's captain flashes a flashlight at 1.00s intervals as measured by space-dock personnel. How often does the flashlight flash relative to the captain?
every .87s
For the flashing of the flashlight in MCQ2, what time interval is the proper time interval?
.87s
The rocket ship of MCQ1 travels to a star many light-years away, then turns around and returns at the same speed. When it returns to the space dock, who would have aged less: the space dock personnel or ship's captain?
the ship's captain
An earth observer notes that clocks on a passing spacecraft run slowly. The person on the spacecraft
feels normal, and her heartbeat and eating habits are normal and observes that Earth clocks are moving slowly
Spaceships A and B are traveling directly toward each other at a speed .5c relative to the earth, and each has a headlight aimed toward the other ship. What value do technicians on ship B get by measuring the speed of the light emitted by ship A's headlig
1.0c
Relativistic formulas for time dilation, length contraction, and mass are valid
only for speeds very close to c
Two observers is different inertial reference frames moving relative to each other at nearly the speed of light see the same two events but, using precise equipment, record different time intervals between the two events. which of the following is true of
both observers are correct
You are in a rocket ship going faster and faster. As your speed increases and your velocity gets closer to the speed of light, which of the following do you observe in your frame of reference?
none of the above
You are in a spaceship with no windows, radios, or other means to check outside. How could you determine whether your spaceship is at rest or moving at constant velocity?
give up, because you cannot tell
The period of a pendulum attached in a spaceship is 2s while the spaceship is parked on Earth. What is the period to an observer on Earth when the spaceship moves at 0.6c with respect to the Earth?
more than 2 seconds
Two spaceships, each moving at a speed of .75c relative to the earth are headed directly toward each other. What do occupants of one ship measure the speed of other ship to be?
.96c
Which of the following statements is true regarding how blackbody radiation changes as the temperature of the radiating object increases?
the max. intensity increases, and the peak wavelength decreases
As red light shines on a piece of metal, no electrons are released. When the red light is slowly changed to shorter wavelength light, nothing happens until yellow light shines on the metal, at which point electrons are released from the metal. If this met
blue
A beam of red light and a beam of blue light have equal intensities. which statement is true?
there are more photons in the red beam
Which of the following is necessarily true?
a single photon of violet light has more energy than a single photon of red light; violet light has more energy than red light
if a photon of energy E ejects electrons from a metal with kinetic energy KE, then a photon with energy E/2
will eject electrons with kinetic energy KE/2
If the momentum of an electron were doubled, how would its wavelength change?
it would be halved
Which of the following can be thought of as either a wave or a particle?
light; electron; and proton
When you throw a baseball, its de Broglie wavelength is
much smaller than the size of an atom's nucleus
Electrons and photons of light are similar in that
all of the above
In Rutherford's famous set of experiments described, the fact that some alpha particles were deflected at large angles indicated that
the nucleus was positive
which of the following electron transitions between two energy states (n) in the hydrogen atom corresponds to the emission of a photon with the longest wavelength?
8-->5
If we set the potential energy of the electron and a proton to be zero hen they are an infinite distance apart, the the lowest energy a bound electron in a hydrogen atom can have is
-13.6 eV
Which of the following is current accepted model of the atom?
none of the above
Light has all of the following except
mass