x (m) 40 30 20 20 10 10 t(s) 0 10 20 30 40 50

C) The natural (Plank) Unit of a physical quantity Q has the form: {Q}Plank= hnlcn2Gn3 h = 1.0545717260000002 x 10-34kg m?s-1 c = 299792458 m/s where: the Plank constant: the light speed: and the universal constant of gravity: = 6.673848 x 10-11kg¬1m³s¬2 n1, n2 and n3 are suitable numbers that ensure the correct dimension of Q. Example: {velocity}plank=C=3.00x10® m/s [n1=0, n2=1, n3=0] Calculate the natural unit of n1= acceleration {a}Plank (3 significant n2= {a}Plank= x 10 m/s? figures) [find n1, n2, n3 and take special care of the order of magnitude] D) Find the area of Palestine in square miles: Apalestine=27000km²= x mile?. Find x. n3= Use: 1 mile=5280 ft ... 1ft=12 inch ... linch=2.54 cm X =

C) The natural (Plank) Unit of a physical quantity Q has the form: {Q}Plank= ħn'cn² G™³ where: the Plank constant: ħ = 1.0545717260000002 x 10-34kg m²s-1 the light speed: and the universal constant of gravity: n1, n2 and n3 are suitable numbers that ensure the correct dimension of Q. c = 299792458 m/s = 6.673848 x 10-1'kg¬'m³s-2 Example: {velocity}plank=C=3.00x10® m/s [n1=0, n2=1, n3=0] Calculate the natural unit of n1= Volume {V}Plank (3 signiflcant n2= {V}plank= x 10 m/s? figures) [find n1, n2, n3 and take special care of the order of magnitude] n3=

Q2) Question is attached.

The speed of light is now defined to be c = 2.99792458 × 108 m/s. (a) Express the speed of light to three significant figures. 4.03.00*10e8 X Your response is off by a multiple of ten. m/s (b) Express the speed of light to five significant figures. 4.02.9979*10e8 X Your response is off by a multiple of ten. m/s (c) Express the speed of light to seven significant figures. 4.0 2.997925*10e8 X Your response is off by a multiple of ten. m/s

Given that A + B = x₁Î + Y₁Ĵ and Ö Ē = x₂Î + y₂), what is ? A ® B = ²/² ( x ₁ + x₂) ₁ + 1/{ (Y₁ +92)ĵ B Î D B = ½ (×₁ − ×₂) Î + ½ (Y₁ −³₂)Î E B = ½¼½ (X₁ − ×₂)Î + ½ (Y₁ + Y2 )Ĵ ³ = ½ (X₁ + X₂) Î + ½ (Y₁ −Y₂)ĵ B = ½ (³₁ −³₂)ĵ

Answer C

Is the answer C.?

What is wrong with the following expressions? How can you correct them? (a) C=AB , (b) C=AB , (c) C=AB , (d) C=AB , (e) C+2A=B , (f) C=AB , (g) AB=AB , (h) C=2AB , (i) C=A/B , and (j) C=A/B .

1.31 A 5-um long slab of p-type silicon of the type of Fig. 1.36b has been doped non-uniformly along the x-axis according to the profile N,(x) 1014[1 + 10°exp(-x/(1 µm)]/cm³. Sketch N(x) vs. x, and show that even if not part of any circuit, the slab possesses a nonzero internal electric field E(x). Calculate E(0) and E(5 um). Hint: since the slab is not part of any circuit, in equilibrium it must have Jdin + Jaim = 0. = 0. (drift) (diff)