Physics questions: light?
I need help with these math problems from my physics study guide.
2. What is the illuminance, in lux, for a piece of paper on a table 2.0m from a point of light source that is producing 1600 lm of luminous flux?
3. A light bulb is 4.1m from a surface. How much luminous flux must the bulb prodeuce if the illuminance required is 22lx?
4. What is the luminous intesity, in candelas, of a bulb with 3.00X10^3lm of luminous flux?
5. A sodium vapor lamp emits ight waves with a frequency of 5.26X10^14 Hz. What is the wavelength of the light?
6. Approximately where in the spectrum is the light that has a requency of 5.50X10^14 Hz?
5) c=(lamba) x (f) then
(lambda)=c/f so
(3×10^8 m/s) / (5.26×10^14hz) = 570nm
#6) c=lambda x f
then lambda= c / f
so (3×10^8 m/s) / (5.50×10^14hz)= 545 nm thus its in the visible light spectrum, ‘green light’
Philips Master SON-T Pia Plus 70W & fluorescent starter
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