# Quiz # 21_2

## Quiz # 21_2

#1

My # 37.35% Then...

100-37.35=62.65=0.6265

0.6265*(cos45)^2=0.31325*100=31.325%

answer positive

working on the rest...

My # 37.35% Then...

100-37.35=62.65=0.6265

0.6265*(cos45)^2=0.31325*100=31.325%

answer positive

working on the rest...

**supr mo**- Guest

## 3 and 4

Number 3

The distance between the third order 2-slit interference maxima on a screen 1.0928 meter from the slits which are 0.1097 mm apart is 3.48 cm. What is the wavelength of the light in nm (see sheet 20',21) ? Indicate with a positive (negative sign) whether you can (cannot) use the small angle approximation (see sheet 23) for the required accuracy of 1% in the quiz.

3.48E-2 / 2 = .0174

tan-1 (.0174/1.0928) = .912209303

(sin (.912209303) * .1097E-3) / 3 = 582nm

answer is positive

Number 4

In single slit diffraction the slit width is 0.1218 mm and the wavelength is 636 nm. Under which angle (in degrees) does the second order diffraction minimum occur (see sheet 25) ? Indicate with a positive (negative sign) whether at 00 a minimum (maximum) occurs.

(636E-9 * 2) / .1218E-3 = .010443349

sin-1 (.010443349) = .59837

answer is negative

The distance between the third order 2-slit interference maxima on a screen 1.0928 meter from the slits which are 0.1097 mm apart is 3.48 cm. What is the wavelength of the light in nm (see sheet 20',21) ? Indicate with a positive (negative sign) whether you can (cannot) use the small angle approximation (see sheet 23) for the required accuracy of 1% in the quiz.

3.48E-2 / 2 = .0174

tan-1 (.0174/1.0928) = .912209303

(sin (.912209303) * .1097E-3) / 3 = 582nm

answer is positive

Number 4

In single slit diffraction the slit width is 0.1218 mm and the wavelength is 636 nm. Under which angle (in degrees) does the second order diffraction minimum occur (see sheet 25) ? Indicate with a positive (negative sign) whether at 00 a minimum (maximum) occurs.

(636E-9 * 2) / .1218E-3 = .010443349

sin-1 (.010443349) = .59837

answer is negative

**krolik**- Guest

## number 2

#2 still wont work for me..

i did cos(62.16)^2 = .218

and then i did (cos(62.16))^2 = .218

and i even did cos (62.16^2) = .1068

and i tried them all as negative but i keep getting it wrong. im not getting the calculator syntax right

i did cos(62.16)^2 = .218

and then i did (cos(62.16))^2 = .218

and i even did cos (62.16^2) = .1068

and i tried them all as negative but i keep getting it wrong. im not getting the calculator syntax right

**me**- Guest

## #3 & #4

Even when I plug in the given values previously posted on the forum for 3 and 4, my numbers punched out in the calculator are so much larger. Like 25 instead of .xxxx. Am I using the wrong mode or something? Is there a setting i need to change to do these problems? I put it on degrees and then radians and still didnt get the correct answer.

**k8**- Guest

## Re: Quiz # 21_2

how did you know to use 45 degrees for theta in the first question? thanks...

**the dude**- Guest

## question 3, i cant get it right

How do you do number 3 i tried doing the equation above and nothing....i even multiplied my answer by 10^-9

**Guest786**- Guest

## number 2

The solution posted above is wrong, the conversion from mm to m is incorrect. It should be E-4 not E-3

**yourmom**- Guest

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