Question

1. What is a continuous spectrum? What is a discrete spectrum?

2. What kind of light sources produce each type of spectrum?

3. The grading used his laboratory ) a. produce only images in the horizontal b. must be rotated in its holder until it produces the desired horizontal pattern c. produces images in the vertical direction d. produce images only left to the slit.

4. The diffraction grading is 14.3° is used at a distance L equals 50.0 cm from the slip. what is the distance D from the slip to the first order image for the blue green wave length of mercury ?show your work.

5. What is the voltage and current of the spectrum tube power supply?

Answer 1

(1)

if the spectrum goes all the way from red to violet, with no gaps, then it is a continuous spectrum.

the characteristic set of discrete spectral lines seen in the emission spectrum and absorptionspectrum of isolated atoms of a chemical element, which only absorb and emit light at particular wavelengths.

(2)

A beam of perfectly white light is used to produce continous spectra

discrete spectral lines are produced when cooler thin gas absorbs certain colors of light produced by hotter dense objects, so for stars, the cooler, low-density upper layers absorb certain colors produced by the deeper, denser layers.

(3)

produces images in the vertical direction

(4)

blue gree wavelength of mercury range is 480 nm to 510 nm so man wavelenght is 495 nm

D = m lamda/ sin theta

    = 1 ( 495 nm)/ sin 14.3°

   = 2.0 * 10 ^-6 m

from the diagram

sin theta = D/ x

x = D/ sin theta = 2.0 * 10 ^-6 m/ sin 14.3 = 8.097 * 10 ^-6 m

(5)

Thehigh tension power supply is used for the experiment where veryhigh voltages is required such as for the experiment of spectrumtubes.

It generates 0-6.5 KV. And works on 220 V ; 50 hz