Field Theory
Circuits
Power & Energy
EMR
History of the Universe
200
In a magnetic field, the field lines point towards the _____
south
200
Which graph most accurately relationship between current and resistance?
A
200
Transformers only work on ___ Current. Why?
Alternating. Transformers require a changing magnetic field.
200
What property of light is demonstrated as light travels around an obstacle?
Diffraction
200
A red giant will eventually become...
a white dwarf
400
B
400
Which of the above circuits will have the dimmest light bulbs?
A
400
Voltage carried in power lines is kept very high. This is to minimize _____
loss of energy, current/heat
400
Why is it better for telescopes to have a large opening?
minimize diffraction, increase resolution
400
Scientists analyze spectra from distant stars, which have dark lines. This sort of spectrum is called...
absorption spectra
600
The gravitational field strength on the surface of the moon is 1.62N/kg. If the radius of the moon is 1737km, what is the mass of the moon? (Scientific Notation to 3 digits)
7.33 x 1022 kg
600
Assuming the human body has a resistance of 1k𝛀, if an automated external defibrillator delivers a shock of 750V, what is the current traveling through the human body?
0.75A
600
A coffee maker has a resistance of 15Ω, and is connected to a 120V power outlet. How much power does this coffee maker use?
960 Watts
600
Most bluetooth devices operate at 2.4GHz. What is the wavelength of EMR emitted by bluetooth devices?
0.125m/12.5cm
600
What information allows scientists to conclude that the universe is expanding?
Red shift
800
If the electric field strength of a charge is 20N/C, what is the new field strength when the charge is tripled, and the distance is halved?
240N/C
800
What is the total resistance of the circuit?
2 ohms
800
A phone charger typically outputs 5V. If a charger is connected to a 120V outlet and the output current is 1.8A, what is the primary current received by the transformer?
0.075A
800
Name all types of EMR that are partially or completely blocked by the Earth’s atmosphere
Some IR, Some UV, long radio, all Gamma, all X-ray
800
What is the benefit of having telescopes in space?
can view EMR that would normally be absorbed by the atmosphere
1000
The Sun has a radius of 696,340 km. It shoots out a solar flare that is 2.03 x 107m tall. What is the gravitational field strength at the tip of the solar flare?
258.45N/kg
1000
If each resistor is 4 ohms, what is the total resistance of the circuit?
6 ohms
1000
Mr. Moon uses a 1200W toaster every morning. If he toasts bread for 2 minutes every morning in November, and the cost of electricity is ¢11.5/kWh, how much money did Mr. Moon spend on toasting bread everyday in November?
$0.138
1000
What is the frequency range of the visible range? Express in terms of THz
750 - 429THz
1000
Name the 3 kinds of spectra. What can we look at through a diffraction grating to create that spectra?
Continuous - white light/light bulb
Emission - neon light/certain hot gas
Absorption - A white light source behind a cool gas