msc
Is Beth checking her email?
yes
What is linear superposition
When two or more waves are present simultaneously at the same place, the resultant disturbance is the sum of the individual waves
Light
Electromagnetic radiation within a certain frequency range. Color depends on what part of the rage the light is on
Voltage
the force that pushes electric charge through a circuit (Volts / V)
What is Beth bringing to our review sessions?
baked goods
Speed of sound
340 m/s
speed of light
300,000,000 m/s
Resistance
the measure of the opposition of flow of the current in a circuit (Ohms / Ω)
Who is our current teacher
Joe
Why is it harder to see saves with a higher frequency?
It's harder to see waves with higher frequency because higher frequency means the waves are closer together and move through more cycles in the same amount of time
When you put a straw in a glass of water, it appears to "bend" at the surface — but the straw hasn't actually moved. Why does it look bent?
Light travels more slowly in water than in air, so it bends (refracts) as it crosses the boundary between the two media. Your brain traces the light rays back in a straight line, placing the submerged part of the straw in a different position than it actually is, making it appear bent.
Equation of resistance in parallel
(1/r1+ 1/r2) inverse thing
When can you meet with Beth
June 1-3
You're standing on a train platform. Two trains are approaching the station from opposite ends of the track, both moving toward you at the same speed, and both blowing their horns at the same frequency.
Do you hear the two horns at the same pitch, or different pitches? Why?
Yes, you hear both horns at the same pitch. Since both trains are moving toward you at the same speed and emitting the same frequency, the Doppler shift is identical for both ( it doesn't matter which direction they're coming from, only their speed relative to you).
A scuba diver shines a flashlight from underwater toward the surface at an angle of 40° from the normal. If the index of refraction of water is 1.33 and air is 1.00, what is the angle of refraction as the light exits into the air?
58.7
Two identical light bulbs are connected in a simple circuit — one in series and one in parallel with a battery.
Which bulb shines brighter?
The parallel bulb shines brighter.
In a parallel circuit, each bulb receives the full voltage of the battery. In a series circuit, the voltage is split between the bulbs, so each one gets only half. Since brightness depends on power delivered, the parallel bulb wins.
Where is Beth rn
writer's residency
If you're standing on the ground, why do you hear the boom after the aircraft has already passed overhead?
By the time the shock wave cone trailing the supersonic aircraft sweeps across your position on the ground, the plane has already traveled well past you. You're hearing the accumulated pressure wave arrive late, after the aircraft has long since moved on.
A ray of light travels from glass (n = 1.5) into air (n = 1.00) at an angle of 30° from the normal. What is the angle of refraction?
48.6
A bird sits safely on a high-voltage power line carrying thousands of volts without getting electrocuted. Yet a person who touches the same power line would likely be killed instantly.
The bird is safe because no current flows through its body. Both of the bird's feet are on the same wire, meaning both feet are at the exact same voltage. Since there is no voltage difference across the bird's body, there is no "push" to drive current through it.