Electromagnetic

Question 1

What produces EMR?

Answer 1

EMR is produced by acceleration of charged particles causing perpendicular electric and magnetic fields

Question 2

What is the Law of Reflection?

Answer 2

Incident rays and reflected rays make equal angles with a line perpendicular to the normal line

Question 3

What is critical angle? Which direction must light travel for critical angle to work?

Answer 3

The critical angle can be calculated from Snell’s Law by setting the reflection angle equal to 90

The light must travel from a faster (lower n) to a slower (higher n) medium

Question 4

What does each variable mean in Thomas Young’s double slit experiment?

Answer 4

x - distance from central maxima to n

d - distance between the slits

n - node

L - distance between slits and screen

Question 5

What is the difference between a prism and a diffraction grating?

Answer 5

Prisms: bend blue light more, refract lower wavelengths and higher frequencies, one spectrum

Diffraction Gratings: bend red light more, refract higher wavelengths and lower frequencies, multispectra

Question 6

What do parts on the graph mean?

Answer 6

Slope: Plank’s constant (h)

X Intercept: threshold frequency (fo)

Y Intercept: work function (W)