Complete Question
One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. Having recently studied optics in your physics class, you're not too surprised to see that the patch of light seems to be a circular diffraction pattern. It appears that the central maximum is about 2 cm across, and you estimate that the distance from the window shade to the wall is about 5 m.
Required:
Estimate the diameter of the pinhole.
Answer:
The diameter is
Explanation:
From the question we are told that
The central maxima is
The distance from the window shade is
The average wavelength of the sun is mathematically evaluated as
Generally the visible light spectrum has a wavelength range between 400 nm to 700 nm
So the initial wavelength of the sun is
and the final wavelength is
Substituting this into the above equation
The diameter is evaluated as
substituting values
Answer:
A pure substance has only one substance while a mixture has two or more substances
Explanation:
A). Since the bulbs are in series, their total resistance is the sum of their individual resistances. The total resistance in the series circuit is 6 ohms.
b). The current in the circuit is (voltage between the ends) / (total resistance) .
Current = 12 V / 6 ohms = 2 Amperes.
c). The power dissipated by any component can be expressed in different ways,
and if we're smart, we pick the formula that makes the problem easy for us.
-- Power = (voltage) x (current)
-- Power = (current)² x (resistance)
-- Power = (voltage)² / (resistance)
For this one, I think the middle formula is easiest.
Power = (current)² x (resistance) = (2 A)² x (3 ohms) = 12 watts for each bulb
d). Each bulb dissipates 12 watts,so for both bulbs, the battery has to supply 24 watts.
Check this solution with the first formula for power, above:
-- Power = (voltage) x (current)
Battery power = (battery voltage) x (current) = (12 V) x (2 A) = 24 watts Check. yay!
Answer:
the car’s final displacement is 60 m
Explanation:
Given;
initail velocity of the car, u = 0
acceleration of the car, a = 0.8 m/s²
time of motion, t = 10 s
The first displacement of the car:
The second displacement of the car;
acceleration, a = 0.4 m/s², time of motion, t = 10 s
The final displacement of the car;
x = x₁ + x₂
x = 40 m + 20 m
x = 60 m
Therefore, the car’s final displacement is 60 m