Answer: (A) The number of waves that pass a point in a certain amount of time.
Explanation:
Electromagnetic waves are categorized according to their frequency f or, equivalently, according to their wavelength λ = c/f. Visible light has a wavelength range from ~400 nm to ~700 nm.
Frequency: Is the number of waves that pass a certain point in a specified amount of time.
Trough: The low point of the wave cycle.
Wavelength: The distance between two successive peaks.
Electromagnetic wave: One of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity.
Answer:
The starting position is 3 m and the object is traveling at 3 m/s
Explanation:
Answer:
Approximately 
and approximately 
.
Explanation:
Let 
and 
denote the capacitance of these two capacitors.
When these two capacitors are connected in parallel, the combined capacitance will be the sum of and . (Think about how connecting these two capacitors in parallel is like adding to the total area of the capacitor plates. That would allow a greater amount of charge to be stored.)
.
On the other hand, when these two capacitors are connected in series, the combined capacitance should satisfy:
.
(Consider how connecting these two capacitors in series is similar to increasing the distance between the capacitor plates. The strength of the electric field (
) between these plates will become smaller. That translates to a smaller capacitance if the amount of charge stored 
stays the same.)
The question states that:
, and
.
Let the capacitance of these two capacitors be 
and 
. The two equations will become:
.
From the first equation:
.
Hence, the 
in the second equation here can be replaced with 
. That equation would then become:
.
Solve for 
:
.
.
.
Solve this quadratic equation for :
or 
.
Substitute back into the equation for :
In other words, these two capacitors have only one possible set of capacitances (even though the previous quadratic equation gave two distinct real roots.) The capacitances of the two capacitors would be approximately 
and approximately (both values are rounded to two significant digits.)
Sample Response: liquids flow freely, they take the shape of the container they are in, but have a definite volume. Like liquids, the shape of a gas changes with the container. This is because the atoms in a gas move rapidly and freely to fill any available space. Unlike liquids, the volume of a gas changes depending on the container it is in.
Answer:
The cellphone's main purpose is to keep people connected, regardless of the distance that separates them. Cellphones, much like traditional phones, allow you to place and receive calls.
Explanation:
, or