Quiz 7

Question 1

E energy density ____ B energy density in an EM wave are

Answer 1

=

Question 2

intensity =

Answer 2

power/area

Question 3

power =

Answer 3

energy/time

Question 4

what is a wave?

Answer 4

a disturbance that propagates, carrying energy, from one place to another

Question 5

the electromagnetic spectrum is expressed in terms of:

Answer 5

energy
wavelength
frequency

Question 6

rank red, gamma, microwave, and violet from lowest to highest energy

Answer 6

microwave
red
violet
gamma

Question 7

what are the 7 types of waves?

Answer 7

radio
microwave
infrared
visible
UV
x-ray
gamma

Question 8

rank from highest to lowest wavelength:
infrared
UV
gamma
microwave
radio
visible
x-ray

Answer 8

radio
microwave
infrared
visible
UV
x-ray
gamma

Question 9

rank from highest to lowest frequency:
infrared
UV
gamma
microwave
radio
visible
x-ray

Answer 9

gamma
x-ray
UV
visible
infrared
microwave
radio

Question 10

rank from highest to lowest temperature:
infrared
UV
gamma
microwave
radio
visible
x-ray

Answer 10

gamma
x-ray
UV
visible
infrared
microwave
radio

Question 11

a higher frequency = _____ energy

Answer 11

higher

Question 12

lower energy = _____ frequency

Answer 12

lower

Question 13

higher wavelength = _____ energy

Answer 13

lower

Question 14

higher energy = _____ wavelength

Answer 14

lower wavelength

Question 15

_____ corgis radiate EM waves

Answer 15

accelerating

Question 16

right hand rule for electromagnetic waves:
palm =
fingers =
thumb =

Answer 16

palm = B
fingers = E
thumb = velocity

Question 17

R= 148
C= 1.50uF
L=0.0357Hz
f=512Hz
V=35.0V
find current

Answer 17

XL= 2πfL = 114.85
Xc = 1/2πfc = 207.23
Z = √(148)^2 + (114.8-207.23)^2 = 174.49
I = V/2 = 35/174.49 = 0.200A

Question 18

R= 148
C= 1.50uF
L=0.0357Hz
f=512Hz
V=35.0V
find voltage across each element if current is 0.200A, XL = 114.85, and Xc = 207.23

Answer 18

VL = IXL = (0.200A)(114.85) = 22.97V
Vc = Ixc = (0.200A)(207.23) = 41.45V
VR = IR = (0.200A)(148) = 29.6V

Question 19

R= 148
C= 1.50uF
L=0.0357Hz
f=512Hz
V=35.0V
find average power consumed if current is 0.200A

Answer 19

P = I^2R = (0.200A)^2(148) = 5.92W

Question 20

R= 148
C= 1.50uF
L=0.0357Hz
f=512Hz
V=35.0V
find resonance frequency

Answer 20

1/2π√LC = 1/2π(0.0357(1.50x10^-6) = 688Hz

Question 21

RLC circuit algorithm

Answer 21

find R, Xc, and XL
use those to find Z
knowing Z, find I

Question 22

spirals =

Answer 22

inductor

Question 23

straight parallel lines =

Answer 23

capacitor

Question 24

zig zag lines =

Answer 24

resistor

Question 25

find current provided by the generator when frequency is large

Answer 25

no inductor V=IR 75 = I(290)

Question 26

find current provided by the generator when frequency is small

Answer 26

no capacitor V=IR 75 = I(710)

Question 27

low frequency = _____ resistance

Answer 27

higher

Question 28

low frequency, a light bulb with a _____ will light up

Answer 28

inductor

Question 29

high frequency, a light bulb with a _____ will light up

Answer 29

capacitor

Question 30

in an RL circuit, does light shine more at higher or lower frequency?

Answer 30

low

Question 31

low frequency = _____ resistance

Answer 31

high

Question 32

low resistance = _____ current

Answer 32

high

Question 33

low frequency = _____ current

Answer 33

high?

Question 34

resistors (VR) in an AC circuit are ____ on frequency

Answer 34

not dependent

Question 35

inductive reactance (XL) depends on _____

Answer 35

frequency of AC generator

Question 36

capacitance reactance (VC) is dependent on _____

Answer 36

frequency of AC generator

Question 37

capacitors use _____ power

Answer 37

no

Question 38

inductors use _____ power

Answer 38

no

Question 39

do resistors use power?

Answer 39

yes