The range of visible lights is from about 380 nm to 750 nm. Question 1: Calculat
ID: 1290358 • Letter: T
Question
The range of visible lights is from about 380 nm to 750 nm.
Question 1: Calculate the range of temperatures (in degrees Fahrenheit, please) for which object will emit maximum radiation in the visible range of the spectrum.
Question 2: Keeping your answer to question 1 in mind, which of the following sources of visible light is likely NOT due to blackbody radiation?
(Select all that apply.) HOW DO YOU KNOW??
(a) Normal household white light bulb
(b) Laptop computer monitor turned on
(c) Stovetop glowing orange
(d) Blue gas flame
(e) Firefly glowing yellow
This equation The range of visible lights is from about 380 nm to 750 nm. Question 1: Calculate the range of temperatures (in degrees Fahrenheit, please) for which object will emit maximum radiation in the visible range of the spectrum. Question 2: Keeping your answer to question 1 in mind, which of the following sources of visible light is likely NOT due to blackbody radiation? (Select all that apply.) HOW DO YOU KNOW?? (a) Normal household white light bulb (b) Laptop computer monitor turned on (c) Stovetop glowing orange (d) Blue gas flame (e) Firefly glowing yellow max and the temperature of an object emitting blackbody radiations is: max = (2.90x10-3 mk)/T states that the relation betweenExplanation / Answer
For the relation Lambda=C/T, T=C/Lambda
Then the range becomes C/750 nm to C/380 nm. That is, 3867 K to 7632 K.
A, C, and D are all possibilities because they involve extremely hot surfaces. The actual temperatures will be less than 3800 K, but it's possible for some people to see the slight coloration. Of course the maximum power emitted will be in the infrared region, but small intensities of light (enough to see) will be emitted in the visible range.
The laptop and firefly are not blackbodies...in a matter of seconds a lightbulb is too hot to put your palm around but your laptop screen can be touched almost anytime. Likewise, a firefly would not survive emitting radiation at a visible peak wavelength.