The EV

Question 1

What is an EV and give equation

Answer 1

• alternative unit for energy
• used for v small energy values in quantum physics

DEF = ENERGY GAINED BY AN ELECTRON WHEN PLACED IN 1V OF PD

V = E/q

Question 2

Explain EV equation

Answer 2

V = E/q

q = universal charge for electrons (same as e)

Question 3

Talk abt intensity/radiant flux

Answer 3

Intensity or radiant flux = power/area
Area = SA of a sphere = 4pir^2
Intensity = inversely proportional to distance squared
Intensity against 1/R^2 graph = directly proportional to

Question 4

Derive I = nave

Answer 4

n = N/V
I = Q/t
Q = Ne
V = LA
v = L/t
SO
I = Q/t = Ne/t = nVe/t = nALe/t = nAve