AnswersTX-Physics CRAtomic Spectra

Atomic Spectra — Cumulative exam Answers

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Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.

Question illustration
A
reversing the battery
B
reversing the nail and using the nail’s head
C
wrapping the wire around the nail more times
D
unwrapping several loops of the wire from the nail
2
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A
mass-energy equivalence
B
mass defect
C
binding energy
D
mass-energy conservation
3

Which animals can hear a sound wave that has 18,500 cycles in 0.75 seconds? Check all that apply.

A
bats
B
moths
C
cats
D
humans
E
birds
F
fish
G
crickets
5

What is luminosity?

A
the amount of energy a star emits in a unit of time
B
the brightness of a star as seen from Earth
C
the average temperature of a star during its life cycle
D
the degree of shift toward the red end of the spectrum
6

How does charging by conduction compare with charging by induction?

A
A charged object is needed in conduction but not in induction.
B
Two neutral objects are needed in conduction but not in induction.
C
Objects must touch in induction but not in conduction.
D
Oppositely charged objects form in induction but not in conduction.
7

Which lists the waves in order of wavelength, from longest to shortest?

A
X-rays, infrared, radio waves
B
infrared, visible light, gamma rays
C
ultraviolet, microwaves, visible light
D
radio waves, gamma rays, visible light
9

Consider the ranges of pitches made by these instruments and vocals.

Question illustration
A
clarinet, bassoon, piccolo, soprano vocal
B
piccolo, oboe, standup bass, tenor vocal
C
tuba, bass guitar, violin, piccolo
D
violin, clarinet, French horn, tuba
10

Visible light travels at a speed 3.0 × 108 of m/s. If red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light?

A
2.2 × 10–15 HZ
B
2.0 × 102 HZ
C
3.0 × 108 HZ
D
4.6 × 1014 HZ
11

A patient is receiving treatments for brain cancer. Which electromagnetic waves are most likely being used as part of the treatment?

A
infrared
B
ultraviolet
C
microwave
D
gamma ray
12

Which is an everyday example of a diffraction grating?

A
A picture of the bottom of a CD or DVD showing rainbow lies going out from the center.
Option A
B
A picture of an upright mirror.
Option B
C
A picture of wave peaks in water.
Option C
D
A picture of bubbles.
Option D
13

Seven-eighths of a sample of hydrogen-3 will have become a stable isotope after 36.9 years. What is the half-life of hydrogen-3?

A
12.3 years
B
18.5 years
C
32.3 years
D
36.9 years
14

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

A
X delivered 97.5 C more than Y.
B
X delivered 6.3 C more than Y.
C
Y delivered 91.2 C more than X.
D
Y delivered 1.3 C more than X.
15

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

A
replacing the battery, because it is not providing current
B
installing new brushes, because they are not making a good connection
C
checking the commutator, because the current is not reversing
D
adding more wire coils in the armature, because the electromagnet is too weak
16

Yellow light has a frequency of 5.2 × 1014 Hz and travels at a speed of 3.0 × 108 m/s. What is the wavelength of yellow light, in meters?

A
5.8 × 10–7 m
B
2.2 × 10–6 m
C
1.7 × 106 m
D
8.2 × 1022 m
17

A point charge of 6.8 C moves at 6.5 × 104 m/s at an angle of 15° to a magnetic field that has a field strength of 1.4 T.

Question illustration
A
1.6 × 10–1 N
B
6.0 × 10–1 N
C
1.6 × 105 N
D
6.0 × 105 N
18

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.

Question illustration
A
No, the interfering waves will always be above X.
B
No, the interfering waves will always fall below X.
C
Yes, the overlap will occur during the slope of the waves.
D
Yes, the overlap will occur when the first wave hits point X.
19

Walt made a study chart listing uses for two types of electromagnetic waves.

Question illustration
A
A: Infrared WavesB: X-rays
B
A: MicrowavesB: Ultraviolet Waves
C
A: Ultraviolet WavesB: Gamma Rays
D
A: X-raysB: Radio Waves
20

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

A
open
B
inverted
C
closed
D
short
21

A charged particle moves at 2.5 × 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10–2 T.

A
3.7 × 10–5 C
B
4.1 × 10–5 C
C
8.8 × 10–5 C
D
1.0 × 10–4 C
22

A Hertzsprung-Russel diagram is shown.

Question illustration
A
red giants
B
white dwarfs
C
supergiants
D
main sequence

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