Answers Crowley Credit Recovery Physics BUnit Test

Unit Test — Cumulative exam Answers

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The diagram shows a nail before and after a procedure was done.

It was made to conduct electricity, which caused the domains to randomize and the nail to become nonmagnetic.

It was rubbed with a magnet, which caused the domains to line up and the nail to become magnetic.

It was struck repeatedly, which caused the domains to randomize and the nail to become nonmagnetic.

It was heated, which caused the domains to line up and the nail to become magnetic.

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

open

inverted

closed

short

What is the main difference between a longitudinal wave and a transverse wave?

A longitudinal wave always travels faster than a transverse wave.

A longitudinal wave does not need a medium to travel through.

A transverse wave is made of particles that move perpendicular to the motion of the wave.

A transverse wave always carries more energy so that it can travel through empty space.

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?

12.3 years

18.5 years

32.3 years

36.9 years

mass-energy equivalencemass defectbinding energymass-energy conservation

mass-energy equivalence

mass defect

binding energy

mass-energy conservation

Which best describes fusion nuclear reactors?

They use rods containing uranium for fuel.

They are currently used for electricity in several highly populated countries.

They are used in some naval vessels, such as submarines.

They have been successful, but they are very expensive to operate.

Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions.

X: Smaller nuclei formY: Thermal energy is producedZ: A larger nucleus forms

X: Large amounts of energy are releasedY: One or more neutrons is releasedZ: Smaller nuclei form

X: One or more neutrons is releasedY: A larger nucleus formsZ: Large amounts of energy are released

X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei form

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.

3.7 × 10–5 C

4.1 × 10–5 C

8.8 × 10–5 C

1.0 × 10–4 C

How does charging by conduction compare with charging by induction?

A charged object is needed in conduction but not in induction.

Two neutral objects are needed in conduction but not in induction.

Objects must touch in induction but not in conduction.

Oppositely charged objects form in induction but not in conduction.

Which device converts kinetic energy into electrical energy?

an electric generator

an electric motor

a step-down transformer

a step-up transformer

A longitudinal wave is shown.

A force of 1.5 × 102 N is exerted on a charge of 1.4 × 10–7 C that is traveling at an angle of 75° to a magnetic field.

8.2 × 102 T

8.5 × 102 T

3.2 × 103 T

6.4 × 1010 T

Jasmine makes a note card about series circuits. She records the points shown.Which change will correct the error on her note card?

switching the headings on the columns

adding the title Parallel Circuits

moving point (2) into the Advantages column

moving point (4) into the Advantages column

Which change can make a generator stronger?

decreasing the size of the slip rings

increasing the size of the slip rings

decreasing the number of coils in the armature

increasing the number of coils in the armature

The table below shows the speed of sound waves from musical sound sources at 20°C.Which conclusion can be made based on the information in the table?

Wave speed and wavelengths can vary inversely to produce the same frequency.

Frequency and wave speed can vary directly to produce the same wavelength.

Wavelengths and frequency can vary inversely to produce the same wave speed.

Frequency and wavelengths can vary directly to produce the same wave speed.

What are some applications of the field of spectroscopy? Select 5 options.

for identifying elements in a sample

for determining the distance and velocity of galaxies

for producing neon lights

for determining types of chemical bonds

for use in medical imaging devices

for killing bacteria in foods

What best explains why a person can become sunburned by spending too much time at the beach?

Sunlight is an electromagnetic wave that gains energy as it travels through air to reach the person.

Sunlight is an electromagnetic wave carrying energy that is absorbed by the skin.

Sunlight is a mechanical wave that vibrates the skin particles to produce heat.

Sunlight is a mechanical wave, and its frequency matches the natural frequency of skin to make heat.

What best describes white light as it travels through a prism? Check all that apply.

The light slows down.

The light bends in the prism.

Light reflects off of the surface of the prism.

The speed of light in the prism is 3.0 × 108 m/s.

The white light breaks into its component colors.

Which statements describe the use of gamma rays to treat cancer? Check all that apply.Gamma rays have low energy and a source must be placed in the body.Gamma rays are absorbed by only the cancer cells.High-energy gamma rays are directed at a tumor from outside of the body.Gamma rays kill cancer cells in a tumor.Gamma rays are applied to a large area of the body.

Gamma rays have low energy and a source must be placed in the body.

Gamma rays are absorbed by only the cancer cells.

High-energy gamma rays are directed at a tumor from outside of the body.

Gamma rays kill cancer cells in a tumor.

Gamma rays are applied to a large area of the body.

A Hertzsprung-Russel diagram is shown.

red giants

white dwarfs

supergiants

main sequence

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