Chapter 7: Part 1
Which of the following statements correctly describe the electromagnetic spsectrum?
-All waves in the spectrum travel at the same speed in a vacuum -The color of visible light is related to its frequency
Which of the following statements correctly describe the photoelectric effect?
-The threshold frequency differs for different metals used in a photoelectric cell -Current begins to flow immediately when the light of the correct frequency shines on the metal plate
Which of the following statements correctly describe the limitations of the Rutherford model of the atom?
-This model could not explain observed atomic line spectra -This model could not explain why electrons did not emit energy continuously
Select the frequency of light having a wavelength of 2.4 x 10^10 nm and the wavelength of light with a frequency of 2.4 x 10^10 Hz.
1.3 x 10^7 nm 1.3 x 10^7 Hz
Which of the following correctly define, depict the symbol, and provide the units for the speed of electromagnetic radiation (light)?
C=3.00x10^8 m/s Light moves at a constant distance per time
Which of the following equations correctly reflects the relationship between energy and frequency?
E=hv
Which of the following correctly expresses energy in terms of Planck's constant?
E=hv E=hc/λ
Energy is quantized. What does this mean?
There is a basic unit of energy that cannot be subdivided further.
Visible light is one type of _______ radiation, which consists of energy propagated by electric and _______ fields that alternately increase and decrease in intensity as they move through space
electromagnetic; magnetic
Visible light and radio waves are both examples of _______ radiation, which has a dual nature, possessing the properties of both _______ and waves.
electromagnetic; particles
The speed of light is the ______ of its frequency and wavelength. In a vacuum, this value is a constant, _________
product; 3.00 x 10^8 m/s
Energy is not continuous, but is quanitized or divided into "packets" each of which contains a definite amount of energy. An energy "packet" is called a(n) _____ and the energy of each "packet" is directly proportional to its_____.
quantum; frequency
Which of the following correctly depict the symbol and units for frequency?
v; Hz
The frequencies and wavelengths of visible light are perceived as different colors. The visible region of the electromagnetic spectrum ranges from higher frequency/shorter wavelength ________ to lower frequency/longer wavelength ________.
violet; red
Select the correct symbol and units for wavelength?
λ (lambda); nm
Which statement correctly describes the quantum number n with reference to the Bohr model of the hydrogen atom?
-n can have any positive, whole number value greater than or equal to 1 -an electron with n=2 is at higher energy than an electron with n=1 -n indicates the energy level of an electron in the atom
According to the Bohr model for the hydrogen atom, the energy of the atom is not continuous but has not certain discrete energy ________, each of which is related to a fixed circular _______ of the electrons around the nucleus. The farther the electron is from the nucleus, the _______ the energy of the system
Levels; orbit; higher
Which of the following statements correctly describes how energy is absorbed by an atom?
The energy of the absorbed radiation must match the difference between the two energy states of the atom
Which of the following determines the color of visible light?
Wavelength and frequency
Place the following types of electromagnetic radiation in order of increasing wavelength: radiowaves, visible light, x-ray, UV radiation, and IR radiation
X-ray UV Radiation Visible Light IR Radiation Radiowaves
The ______ of a wave is the number of wave cycles per second. This quantity is given the symbol v and has units of s^-1 or ________
frequency; Hz
The speed of a wave is determined by multiplying the ________ of the wave by its wavelength. In a vacuum all electromagnetic radiation travels at a constant speed ________, which is equal to 3.00 x 10^8 m/s.
frequency; light
Atoms, like all other matter, have specific energy levels within them. For an atom to absorb radiation, the energy of the radiation must match the energy ________ between the two energy levels in the atoms.
gap
Wavelength and frequency are _______ proportional to each other. As wavelength increases, frequency will ________.
inversely; decrease
Arrange the following regions of the electromagnetic spectrum in order of increasing frequency; infrared, microwave, gamma, visible?
microwave<infrared<visible<gamma
Then phenomenom where an electric current is produced by shining a light on a metal plate is called the _______ effect. The minimum frequency required to cause a current to flow is called the _______ frequency. This frequency depends on the identity of the metal used
photoelectric; threshold
All waves in the electromagnetic spectrum travel at the same ______ through a vacuum, but differ in their frequency and wavelength. A wave length with a long (large) wavelength will have a _______ frequency.
speed; low
Rutherford's Nuclear Model of the atom cannot exist according to classical physics because charged particles like electrons in orbit around a nucleus would continuously lose energy. The result would be that as electrons lose energy they would ________.
spiral into the nucleus to collapse the atom
The distance a wave travels during one cycle is called its _______. This is usually measured as the distance two ______ or two troughs
wavelengths; crest
Match each frequency/wavelength pair, given that the speed of light is 3.00 x 10^8 m/s v=7.23 x 10^14 Hz <--------> λ=662 nm <--------> v=6.21 x 10^10 Hz <------> λ= 3.12 x 10^-12 m <------>
λ=415nm v=4.53 x 10^14 Hz λ=4.83mm v=9.62 x 10^19 Hz