Circuits, Magnetism, Waves and Sound

Question 1

What happens to current when light bulbs are in parallel circuit ?

Answer 1

As more light bulbs are connected in a parallel circuit, the current coming from the power source INCREASES

Question 2

What happens to brightness of light bulbs in a series circuit ?

Answer 2

more identical light bulbs are connected in a Series circuit, the brightness of each bulb: DECREASES

Question 3

What happens to brightness of each light bulb in a parallel circuit

Answer 3

As more identical light bulbs are connected in a parallel circuit, the brightness of each bulb STAYS THE SAME

Question 4

What does magnetic force on moving charged particle alter ?

Answer 4

The magnetic force on a moving charged particle alters the particle’s DIRECTION

Question 5

If a train sounds its whistle as it moves toward you with a constant speed. Which of the following quantities is increasing with time?

Answer 5

LOUDNESS

Question 6

Describe the relationship between the magnetic field in a current-carrying wire and distance of wire

Answer 6

magnetic field from a current-carrying wire, which is INVERSELY proportional to the distance from the wire

Question 7

Describe relationship of magnetic field on particle moving through a field.

Answer 7

The magnetic force NEVER does work on a particle moving through a magnetic field. It acts PERPENDICULAR to direction of motion

Question 8

what is the formula for period ?

Answer 8

T= 1/ f
1/ frequency

Question 9

what is unit for frequency ?

Answer 9

1/sec = 1 HZ

Question 10

What is power in terms of current and voltage?

Answer 10

Power = I x V
Power = current x voltage

Question 11

What is the numerical value to radical 2 ?

Answer 11

square root of 2 = 1.4

Question 12

What is the equation for frequency of harmonics of waves on ropes ?

Answer 12

frequencies of harmonics of waves on ropes is fn= (n/2L ) x v

Question 13

What is one main rule for waves regarding speed?

Answer 13

Speed of a wave depends on the type of wave and the medium

Question 14

What is the relationship between flow speed and pressure ?

Answer 14

As flow speed increases , pressure Decreases

Question 15

What is the continuity equation ?

Answer 15

Continuity Equation (A1v1 = A2v2),

if the available area through which to flow decreases, the speed increases to keep the flow rate constant.

Question 16

What occurs during constructive interference of waves?

Answer 16

Constructive interference: occurs when two waves are perfectly in phase.

Question 17

When can waves NOT constructively interfere ?

Answer 17

if waves have DIFFERENT WAVELENGTHS

Question 18

what happens if you have same pitch and intensity ?

Answer 18

Same pitch and intensity = SAME LOUDNESS

Question 19

What is the period for pendulum ?

Answer 19

period for pendulum
T = 2 pi x square root of L/g

Question 20

What are the two major properties of waves?

Answer 20

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.

Question 21

What is the frequency of a fundamental standing wave?

Answer 21

The fundamental standing wave has harmonic number n = 1, so we have

fn= nv/2L hence fn= 1 x v/ 2L

Question 22

give formulas for Power using resistance and current

Answer 22

P= I^2/R , P= V^2/R