TABLE 10.3 Quantity atomic mass unit Avogadro\'s constant electronic charge Fara
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Question
TABLE 10.3 Quantity atomic mass unit Avogadro's constant electronic charge Faraday constant Symbol Value 1.660565x 1027 kg amu N or NA 6.022094x 1023 mol 1.6021892×10-19 C 9.648456x104 C/mol 0.0820568 L:atm gas constant mol K 8.314510J mol K mass of electron mass of neutron mass of proton Planck's constant Rydberg constant speed of light in vacuum c 9.109534x10-31 kg 1.6745943x1027 kg 1.6726485x1027kg 6.626176x1034 J s 1.0967758 10' m 1 2.997924x 108 m/s 1. Determine the frequency of a photon of 5.0 x 10 meter wavelength. 2. What is the energy (in joules) of the photon in question 1?Explanation / Answer
1)
Given:
lambda = 5*10^-7 m
use:
f = c/lambda
=(3.0*10^8 m/s)/(5*10^-7 m)
= 6.0*10^14 Hz
Answer: 6.0*10^14 Hz
2)
Given:
lambda = 5*10^-7 m
use:
E = h*c/lambda
=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(5*10^-7 m)
= 3.976*10^-19 J
Answer: 4.0*10^-19 J
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