اسئلة ليزر

1. What is the wavelength (in nanometers) of light having a frequency of 8.6 ? 1013 Hz?
A) 3.5 nm
B) 3.5 ? 103 nm
C) 3.5 ? 106 nm
D) 2.9 ? 105 nm


2. What is the frequency (in Hz) of light having a wavelength of 566 nm.
A) 1.89 Hz
B) 5.30 Hz
C) 1.89 ? 106 Hz
D) 5.30 ? 1014 Hz


3. What is the frequency of light having a wavelength of 456 nm?
A) 1.37 ? 102 Hz
B) 6.58 ? 105 Hz
C) 6.58 ? 1014 Hz
D) 1.37 ? 1014 Hz


4. What is the wavelength (in nanometers) of radiation having a frequency of 2.45 ? 109 Hz? (This is the type of radiation used in microwave ovens.)
A) 1.22 ? 108 nm
B) 8.20 ? 109 nm
C) 1.22 ? 1011 nm
D) 8.20 ? 1012 nm


5. The average distance between Mars and Earth is about 1.3 ? 108 miles. How long would it take TV pictures transmitted from the Viking space vehicle on Mars surface to reach Earth? (1 mile = 1.61 km.)
A) 0.70 s
B) 7.0 ? 102 s
C) 2.7 ? 103 s
D) 1.0 ? 105 s


6. How many seconds would it take a radio wave to travel from the planet Venus to Earth? (Average distance from Venus to Earth = 28 million miles.)
A) 1.5 ? 102 s
B) 9.3 ? 101 s
C) 9.3 s
D) 0.15 s


7. The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom. Calculate the wavelength of this radiation (to three significant figures). In which region of the electromagnetic spectrum is this wavelength found?
A) 3.06 ? 107 nm, microwave
B) 3.06 ? 1010 nm, radio wave
C) 3.26 ? 107 nm, microwave
D) 3.26 ? 1010 nm, radio wave


8. The SI unit of length is the meter, which is defined as the length equal to 1,650,763.73 wavelengths of the light emitted by a particular energy transition in krypton atoms. Calculate the frequency of the light to three significant figures.
A) 182 s–1
B) 1.82 ? 1014 s–1
C) 4.95 s–1
D) 4.95 ? 1014 s–1


9. A photon has a wavelength of 624 nm. Calculate the energy of the photon in joules.
A) 3.19 ? 10–16 J
B) 3.19 ? 10–19 J
C) 1.24 ? 10–22 J
D) 3.19 ? 10–28 J


10. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 ? 1014 Hz. Calculate the wavelength, in nm, associated with this radiation.
A) 2.5 ? 10–3 nm
B) 4.0 ? 102 nm
C) 4.5 ? 102 nm
D) 4.8 ? 102 nm


11. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 ? 1014 Hz. Calculate the energy, in joules, of a single photon associated with this frequency.
A) 2.6 ? 10–31 J
B) 2.6 ? 10–22 J
C) 5.0 ? 10–19 J
D) 5.0 ? 10–16 J


12. A photon has a frequency of 6.0 ? 104 Hz. (a) Convert this frequency into wavelength (nm). Does this frequency fall in the visible region?
A) 5.0 ? 1012 nm; no, radiowave
B) 5.0 ? 109 nm; no, radiowave
C) 2.0 ? 105 nm; no, microwave
D) 5.0 ? 103 nm; no, infrared


13. A photon has a frequency of 6.0 ? 104 Hz. Calculate the energy (in joules) of this photon.
A) 4.0 ? 1039 J
B) 9.0 ? 1037 J
C) 4.0 ? 10–29 J
D) 1.1 ? 10–38 J