Answer:
The values of the two resistors are 48 ohms and 12 ohms.
Explanation:
Power (P) = Voltage^2 (V^2) ÷ Resistance (R)
R = V^2 ÷ P
The minimum power drawn by the heater is 300 watts
Voltage is 120 V
R = 120^2 ÷ 300 = 14,400÷300 = 48 ohms
The maximum power drawn by the heater is 1200 watts
R = 120^2 ÷ 1200 = 14,400 ÷ 1200 = 12 ohms
Answer:
a) θc = 44.21⁰.
b) θc = 41.14⁰
c) θc = 40.36⁰
Explanation:
sin θ =
For air,
n₂ = 1
so,
sin θ =
(a) fluorite : n₁ = 1.434⁰
sin θ = 0.697 θc = 44.21⁰.
(b) crown glass: n₁ = 1.52⁰
sin θ = 0.657 θc = 41.14⁰.
(c) sodium chloride : n₁= 1.544⁰
sin θ = 0.647 θc = 40.36⁰.