1. While doing an experiment with volatile materials inchemistry lab, your appar

Question

1. While doing an experiment with volatile materials inchemistry lab, your apparatus blows up with a bright flash oflight. There just happened to be a phonometer turned on in the lab,nd it registered total energy of 1.19 x 10^-14 J. The total numberof photons was 30 000, and thy all had the same wavelenght.
a) What color of light did you see? b) What was the wavelenght of the light? c) What is the frequency of the light? Useful information you may need:

Red                                                                                    700- 650 nm Orange                                                                               649 - 580 nm Yellow                                                                                 579- 575 nm Green                                                                                  574- 490 nm Blue                                                                                    489- 455 nm Indigo                                                                                  454- 425 nm Violet                                                                                  424- 400 nm 1. While doing an experiment with volatile materials inchemistry lab, your apparatus blows up with a bright flash oflight. There just happened to be a phonometer turned on in the lab,nd it registered total energy of 1.19 x 10^-14 J. The total numberof photons was 30 000, and thy all had the same wavelenght.
a) What color of light did you see? b) What was the wavelenght of the light? c) What is the frequency of the light? Useful information you may need:

Red                                                                                    700- 650 nm Orange                                                                               649 - 580 nm Yellow                                                                                 579- 575 nm Green                                                                                  574- 490 nm Blue                                                                                    489- 455 nm Indigo                                                                                  454- 425 nm Violet                                                                                  424- 400 nm Useful information you may need:

Red                                                                                    700- 650 nm Orange                                                                               649 - 580 nm Yellow                                                                                 579- 575 nm Green                                                                                  574- 490 nm Blue                                                                                    489- 455 nm Indigo                                                                                  454- 425 nm Violet                                                                                  424- 400 nm

Explanation / Answer

total energy of 1.19 x 10^-14 J. The total number of photons was 30 000. now we know that energy is given by : nhc/ where n is total no of photons           h isthe plancks constant value = 6.63 x 10-34 J s           c isthe speed of the light value = 3 x 108 m/s           is the wavelenght of light in m so nhc/ = 1.19 x 10^-14 J = 30000*6.63 x 10-34*3x 108 /1.19x 10-14    = 5.014 x 10-7 m    = 501.4 nm: sothis wavelenght values lies in range: Green                       574- 490 nm    = 5.014 x 10-7 m    = 501.4 nm: sothis wavelenght values lies in range: Green                       574- 490 nm 1)colour of light is green 2) wavelenght of light is =                                    = 501.4 nm                                     = 5.014 x 10-7 m 3) now frequency of light we know that v = c/ where v is the ferquency of light. v = 3x 108/ 5.014 x 10-7 m     = 5.9829 x 1014 Hz

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