Data: Speed of light = 2.998-10^8 ms^-1; mass of electron 9.109 10^-31kg; Planck
ID: 965367 • Letter: D
Question
Data: Speed of light = 2.998-10^8 ms^-1; mass of electron 9.109 10^-31kg; Planck's constant = 6.626 10^-34 J s; Avogadro's number = 6.022 10^23 mol^-1 Electromagnetic wave A represents infrared light and electromagnetic wave B represents visible light. Compared with electromagnetic wave B, electromagnetic wave A has (a higher/a lower/the same) frequency and (a longer/a shorter/the same) wavelength. A photon has energy of 3.55 10^-19 J. The wavelength of this light is: 1.87 10^-15 m 2.04 10^-15 m 3.34 10^-9 m 5.60 10^-7 m 6.11 10^-7 m 6.53 10^-4 m 7.13 10^-4 m None of the above. The correct wavelength is m.Explanation / Answer
1.
IR = low frequency, then high wavelength
Visible = high frequency, lower wavelngth
choose:
then ... HIGHER freuqnecy and LOWER wavelength
the ratio frequency = c/Wavelength)
2.
E = 3.25*10^-19 J
change to WL
E = hc/WL
WL = hc/E
WL = (6.3*10^-34)(3*10^8)/(3.25*10^-19) = 0.000000581538 m = 5.8*10^-7 m choose D
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