Circuits, Magnetism, Waves and Sound Flashcards
What happens to current when light bulbs are in parallel circuit ?
As more light bulbs are connected in a parallel circuit, the current coming from the power source INCREASES
What happens to brightness of light bulbs in a series circuit ?
more identical light bulbs are connected in a Series circuit, the brightness of each bulb: DECREASES
What happens to brightness of each light bulb in a parallel circuit
As more identical light bulbs are connected in a parallel circuit, the brightness of each bulb STAYS THE SAME
What does magnetic force on moving charged particle alter ?
The magnetic force on a moving charged particle alters the particle’s DIRECTION
If a train sounds its whistle as it moves toward you with a constant speed. Which of the following quantities is increasing with time?
LOUDNESS
Describe the relationship between the magnetic field in a current-carrying wire and distance of wire
magnetic field from a current-carrying wire, which is INVERSELY proportional to the distance from the wire
Describe relationship of magnetic field on particle moving through a field.
The magnetic force NEVER does work on a particle moving through a magnetic field. It acts PERPENDICULAR to direction of motion
what is the formula for period ?
T= 1/ f
1/ frequency
what is unit for frequency ?
1/sec = 1 HZ
What is power in terms of current and voltage?
Power = I x V
Power = current x voltage
What is the numerical value to radical 2 ?
square root of 2 = 1.4
What is the equation for frequency of harmonics of waves on ropes ?
frequencies of harmonics of waves on ropes is fn= (n/2L ) x v
What is one main rule for waves regarding speed?
Speed of a wave depends on the type of wave and the medium
What is the relationship between flow speed and pressure ?
As flow speed increases , pressure Decreases
What is the continuity equation ?
Continuity Equation (A1v1 = A2v2),
if the available area through which to flow decreases, the speed increases to keep the flow rate constant.
What occurs during constructive interference of waves?
Constructive interference: occurs when two waves are perfectly in phase.
When can waves NOT constructively interfere ?
if waves have DIFFERENT WAVELENGTHS
what happens if you have same pitch and intensity ?
Same pitch and intensity = SAME LOUDNESS
What is the period for pendulum ?
period for pendulum
T = 2 pi x square root of L/g
What are the two major properties of waves?
The first property is that waves maintain their frequency when they change from one material to another . Second, one must recognize that v= λf any wave.
Since the frequency is constant, if the wavelength decreases, the velocity must also decrease.
What is the frequency of a fundamental standing wave?
The fundamental standing wave has harmonic number n = 1, so we have
fn= nv/2L hence fn= 1 x v/ 2L
give formulas for Power using resistance and current
P= I^2/R , P= V^2/R
