Sci 206 midterm || ALREADY PASSED!!
If you pull a permanent magnet rapidly away from a tank circuit, what is likely to happen inthat
circuit? correct answers Charge will oscillate in the tank's capacitor and inductor.
A tank circuit consists of an inductor and a capacitor. Give a simple explanation for why
themagnetic field in the inductor is strongest at the moment that the separated charge in
thecapacitor reaches zero. correct answers The inductor's magnetic field contains energy and it
peaks when the capacitor's energy is zero.
The metal wires from which most tank circuits are made have electrical resistances. Why dothese
resistances prevent charge from oscillating forever in a tank circuit, and what happensto the tank
circuit's energy as time passes? correct answers The wires waste the tank circuit's energy as
thermal energy, gradually reducing the amount of charge sloshing in the tank until the sloshing
stops altogether
Although a particular AM radio station claims to transmit 50,000 W of music power,
that'sactually its average power. There are times when it transmits more power than that
andtimes when it transmits less. Explain correct answers The AM station changes the power of
its transmission in order to represent air pressure fluctuations with the radio wave
Porous unglazed ceramics can absorb water and moisture. Why are they unsuitable for usein a
microwave oven? correct answers Water trapped in the ceramic would absorb microwaves, and
the ceramic would becomeextremely hot. It might even shatter
Why is it so important that a microwave oven turn off when you open the door? correct answers
Releasing the microwaves into the room wouldn't be healthy
Is a thick, smooth‐edged stainless steel bowl dangerous in a microwave oven? correct answers
No (although it may alter the rate at which the food nearby cooks).
If you're wearing polarizing sunglasses and want to see who else is wearing polarizingsunglasses,
you only have to turn your head sideways and look to see which people nowhave sun‐ glasses
that appear completely opaque. Why does this test work? correct answers Polarizing sunglasses
normally block horizontally polarized light, so when you look at someone'seyes when they are
wearing polarizing sunglasses, you see only vertically polarized light. If youwear polarizing
sunglasses and tip your head sideways, then your sunglasses will block verticallypolarized light.
You will see no light coming from the eyes of other people wearing polarizingsunglasses
When astronauts aboard the space shuttle look down at Earth, its atmosphere appears blue.Why?
correct answers Rayleigh scattering deflects blue light in all directions
While a sodium atom is in its ground state, it cannot emit light. Why not? correct answers There
is no lower energy state to which it can make a transition and, while it remains in the
ground state, its electrons are in standing waves and cannot emit electromagnetic waves.
If you pull a permanent magnet rapidly away from a tank circuit, what is likely to happen inthat
circuit? correct answers Charge will oscillate in the tank's capacitor and inductor.
A tank circuit consists of an inductor and a capacitor. Give a simple explanation for why
themagnetic field in the inductor is strongest at the moment that the separated charge in
thecapacitor reaches zero. correct answers The inductor's magnetic field contains energy and it
peaks when the capacitor's energy is zero.
The metal wires from which most tank circuits are made have electrical resistances. Why dothese
resistances prevent charge from oscillating forever in a tank circuit, and what happensto the tank
circuit's energy as time passes? correct answers The wires waste the tank circuit's energy as
thermal energy, gradually reducing the amount of charge sloshing in the tank until the sloshing
stops altogether
Although a particular AM radio station claims to transmit 50,000 W of music power,
that'sactually its average power. There are times when it transmits more power than that
andtimes when it transmits less. Explain correct answers The AM station changes the power of
its transmission in order to represent air pressure fluctuations with the radio wave
Porous unglazed ceramics can absorb water and moisture. Why are they unsuitable for usein a
microwave oven? correct answers Water trapped in the ceramic would absorb microwaves, and
the ceramic would becomeextremely hot. It might even shatter
Why is it so important that a microwave oven turn off when you open the door? correct answers
Releasing the microwaves into the room wouldn't be healthy
Is a thick, smooth‐edged stainless steel bowl dangerous in a microwave oven? correct answers
No (although it may alter the rate at which the food nearby cooks).
If you're wearing polarizing sunglasses and want to see who else is wearing polarizingsunglasses,
you only have to turn your head sideways and look to see which people nowhave sun‐ glasses
that appear completely opaque. Why does this test work? correct answers Polarizing sunglasses
normally block horizontally polarized light, so when you look at someone'seyes when they are
wearing polarizing sunglasses, you see only vertically polarized light. If youwear polarizing
sunglasses and tip your head sideways, then your sunglasses will block verticallypolarized light.
You will see no light coming from the eyes of other people wearing polarizingsunglasses
When astronauts aboard the space shuttle look down at Earth, its atmosphere appears blue.Why?
correct answers Rayleigh scattering deflects blue light in all directions
While a sodium atom is in its ground state, it cannot emit light. Why not? correct answers There
is no lower energy state to which it can make a transition and, while it remains in the
ground state, its electrons are in standing waves and cannot emit electromagnetic waves.
