Chapter 8 & 10 Flashcards
The type of EM radiation that has frequency just a bit shorter than that of visible light is
infrared
Which of the following is not a common use of microwaves?
medical imaging.
EM waves in a vacuum travel at a speed
(A) of c.
(B) that varies with their wavelength.
(C) that varies with their intensity.
(D) of 3 * 108 m/s.
A and D
a quantum of electromagnetic radiation
photon
radar utilizes this
microwaves
one way for an excited atom to lose energy
photon emission
in the Bohr model of the atom this is quantized
electron energy
tells us that particles can’t be precisely localized
Heisenberg uncertainty principle
the lowest energy level in an atom
ground state
causes an electron to make a transition to a higher energy level
photon absorption
works with AC but not DC
transformer
causes skin to tan
ultraviolet rays
the highest frequency electromagnetic waves
gamma rays
The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
x ray.
The EM wave that has the highest frequency in this list is
gamma rays.
What does “IR” stand for?
infrared
The lowest frequency visible light is
red
The principle of an electric generator is that
When a coil of wire is mechanically rotated in a magnetic field, AC electricity is produced.
What is the de Broglie wavelength of an electron traveling 100 m/s? (The mass of an electron is 9.11 x 10-31 kg.)
7.28 * 10-6 m
The type of EM radiation that has frequency just a bit longer than that of visible light is
ultraviolet.
Which of the following infers that scientific knowledge has intrinsic, fundamental limitations
uncertainty principle.
What is the frequency of an EM wave that has a wavelength of 1 meter?
3 * 108 Hz
An atom can be excited into a higher energy state by
absorbing a photon.
What’s the Big Bang?
the creation of the universe.
A magnetic field is created by an electric charge if the charge is
moving
The fact that a particle cannot be precisely localized is the
uncertainty principle.
The wavelength in meters of an electromagnetic wave from an FM station broadcasting at 93.9 megahertz on your radio is
3.19
A radio transmitter broadcasts at a frequency of 20 MHz. What is the wavelength of the electromagnetic wave in meters?
15
A transformer steps up a 120 V input voltage to 600 V output. If there are 4000 turns of wire on the output coil, how many turns must there be on the input coil?
800
A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
the changing magnetic field induces an electric field in the wire.
The lowest energy level in an atom is its
ground state.
A transformer is designed to step down the 120V line voltage to 9V. If there are 200 turns on the input coil, how many turns should there be on the output coil?
15
What is the symbol used for Planck’s constant?
h
An excited atom can lose energy by
emitting a photon.
The type of EM waves used in radar is
microwave
What does “UV” stand for?
ultraviolet
A quantum of electromagnetic radiation is a
photon.
What is “excluded” by the Pauli exclusion principle?
electrons in the same quantum state.
The person who expounded the uncertainty principle was
Werner Heisenberg.
If the speed of an electron increases, its de Broglie wavelength
decreases.
The energy associated with a photon of blue light is _____ the energy associated with a photon of red light. (The frequency of red light is about 4.4 * 1014 Hz, and the frequency of blue light is about 6.4 * 1014 Hz.)
greater than
What does it mean for something to be “quantized?”
it can have only certain discrete values.
The highest frequency visible light is
violet
