Answer:
50% of unpolarised light passes through the first filter because, on average, 50% of the waves are aligned with the fiter's axis. Intensity is reduced by a factor 0.5.
The second filter then reduces the intensity by a factor cos²(θ)
Explanation:
Your answer is C. hope this helped! :)
Answer:
A certain battery can power a 100 Ohm-resistance device for 4 hours. How long can the battery power a 200 Ohm device? Ans: 8 ohms
Part B)
If you put two of these batteries in series with each other - still powering a device with the original 100 Ohm resistance - how long would the batteries last? (Note: you have two batteries now, so twice the energy to begin with than with one battery.)
t₁=8hr
t₂=2hr
Explanation:
Given that,
R₁ =100Ω
R₂ =200Ω
t₁ =4hr
Part A
The expression for energy dessipated across a resistor when it is connected with a single resistor (R) is
Here V is the voltage across the source, t is time
energy dissipated across 200ohms is the same as energy dissipated across 100ohms
rearrange the above equation t₂
Part b
Now two batteries are in series
total emf =2V
use the equation below
C) is the correct answer.
Answer:
the right answer is density of metal v1.v2