AnswersTX-Physics CRAtomic Spectra

Atomic Spectra — Cumulative exam Answers

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A boat moves up and down on a lake as a wave passes by. If the boat oscillates 10 times in 2 seconds, what is the period of the wave?

A
0.2 seconds
B
2 seconds
C
5 seconds
D
10 seconds
2
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The diagram shows light passing through an opening and forming bands.

Question illustration
A
n = 0 and n = 1
B
n = 0 and n = 3
C
n = 1 and n = 2
D
n = 2 and n = 3
3

At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity?

A
The temperature of the reactor is lowered because high temperature and pressure are needed.
B
The temperature of the reactor is raised because the reaction slows down at higher temperatures.
C
The exposure between the fuel rods and a neutron-absorbing material is increased.
D
The exposure between the fuel rods and a neutron-absorbing material is reduced.
4

Which fields would most likely make use of spectroscopy techniques? Select 4 options.

A
food production
B
medical research
C
scientific research
D
space research
E
weather forecasting
5

Which lists the correct steps that occur when using a diffraction grating to bend light?

A
diffracted wavelengths reach the eyes → different wavelengths of light bend at different angles → the eyes see different colors → light strikes the grooves
B
different wavelengths of light bend at different angles → light strikes the grooves → diffracted wavelengths reach the eyes → the eyes see different colors
C
diffracted wavelengths reach the eyes → the eyes see different colors → light strikes the grooves → different wavelengths of light bend at different angles
D
light strikes the grooves → different wavelengths of light bend at different angles → diffracted wavelengths reach the eyes → the eyes see different colors
6

A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T.

A
9.1 × 10–5 m/s
B
1.3 × 10–4 m/s
C
7.6 × 103 m/s
D
1.1 × 104 m/s
7

Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.

A
the type of metal of the wire
B
the amount of the current
C
the direction of the current
D
the temperature of the wire
E
the distance from the wire
8

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward.

A
constructive interference
B
destructive interference
C
a reflecting wave
D
wave refraction
9

The wave shown below is produced in a rope.Which shows the motion of the rope at Point P as the wave passes through it?

Question illustration
A
A dot with a vector drawn right and a vector drawn left.
Option A
B
A dot vector drawn up and vector drawn down.
Option B
C
A dot with a vector drawn up to the right and a vector drawn down to the left.
Option C
D
A dot with a vector drawn up to the left and a vector drawn down to the right.
Option D
10

A current of 1.8 A delivers 2.5 C of charge.How much time was required?

A
0.70 s
B
0.72 s
C
1.4 s
D
4.5 s
11

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

A
0.50 Ω
B
1.1 Ω
C
2.0 Ω
D
2.3 Ω
12

Which changes in an electric motor will make the motor stronger? Select 3 options.

A
using a stronger permanent magnet
B
using a weaker permanent magnet
C
increasing current in the electromagnet
D
decreasing current in the electromagnet
E
increasing the distance between the magnets
F
decreasing the distance between the magnets
13

A wave has a wavelength of 3.3 m and a speed of 5.6 m/s. What is the frequency of this wave?

A
0.59 Hz
B
1.7 Hz
C
3.4 Hz
D
18 Hz
14

Which best explains why infrared waves are ineffective for treating cancer?

A
They have frequencies that are too high to kill cancer cells.
B
They have short wavelengths, which can be harmful to healthy cells.
C
They do not transfer enough energy to destroy cancer cells.
D
They have long wavelengths, which can be harmful to healthy cells.
15

A circuit is built based on this circuit diagram.

Question illustration
A
0.61 Ω
B
1.6 Ω
C
7.5 Ω
D
18 Ω
16

Tony uses the device shown in the diagram to model how an electromagnet is used in his uncle’s scrap metal yard.

Question illustration
A
removing the battery
B
removing the iron nail
C
moving the wire loops closer together
D
spreading the wire loops farther apart
17

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply.

A
The gravitational force has an infinite reach.
B
The electrical force has an infinite reach.
C
The gravitational force is inversely proportional to the distance.
D
The electrical force is inversely proportional to the distance.
E
The gravitational force is inversely proportional to the square of the distance.
F
The electrical force is inversely proportional to the square of the distance.
18

The image shows the right-hand rule being used for a current-carrying wire.

Question illustration
A
When the current flows down the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
B
When the current flows up the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
C
When the current flows down the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
D
When the current flows up the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
19

Which shows the correct order of events after the big bang occurred?

A
strong force separated from the unified force, inflationary expansion occurred, quarks and electrons formed, electromagnetic and weak forces separated from the unified force, gravity separated from the unified force
B
electromagnetic and weak forces separated from the unified force, gravity separated from the unified force, strong force separated from the unified force, inflationary expansion occurred, quarks and electrons formed
C
gravity separated from the unified force, strong force separated from the unified force, inflationary expansion occurred, electromagnetic and weak forces separated from the unified force, quarks and electrons formed
D
quarks and electrons formed, electromagnetic and weak forces separated from the unified force, inflationary expansion occurred, strong force separated from the unified force, gravity separated from the unified force
20

A car makes sound as it moves toward a stationary observer. What best describes the sound wave heard by the observer compared with the sound heard by the car’s driver?

A
higher frequency; shorter wavelength
B
higher frequency; longer wavelength
C
lower frequency; shorter wavelength
D
lower frequency; longer wavelength

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