# Modern Physics Theories Quiz: Trivia!

38 Questions | Total Attempts: 597  Settings  Are you interested in modern physics theories? Modern physics is a division of physics that includes quantum physics, special relativity, and general relativity. Classical physics is typically concerned with every-day problems. This problem-solving includes speeds that are relatively lower than the speed of light, sizes that are bigger than atoms, and rather small energies. Modern physics involves the examination of extreme conditions. This quiz will help you understand current physics theories. All the best.

• 1.
When light is directed at a metal surface, the energies of the emitted electrons:
• A.

Vary with the intensity of the light

• B.

Vary with the frequency of the light

• C.

Vary with the speed of the light

• D.

Are random

• 2.
The photoelectric effect can be understood on the basis of:
• A.

The electromagnetic theory of light

• B.

The interference of light waves

• C.

The special theory of relativity

• D.

None of these

• 3.
In a vacuum, all photons have the same_____________
• A.

Frequency

• B.

Wavelength

• C.

Energy

• D.

Speed

• 4.
The mass of a photon:
• A.

Is 0

• B.

Is the same as that of an electron

• C.

Depends on its frequency

• D.

Is the size of the x-rays emitted

• 5.
The rate at which an object emits electromagnetic energy does not depend on its:
• A.

Surface area

• B.

Mass

• C.

Temperature

• D.

• 6.
When the speed of the electrons that strike a metal surface is increased, the result is an increase in
• A.

The number of x-rays emitted

• B.

The frequency of the x-rays emitted

• C.

The speed of the x-rays emitted

• D.

The size of the x-rays emitted

• 7.
A phenomenon that cannot be understood with the help of the quantum theory of light is
• A.

The photoelectric effect

• B.

X-ray production

• C.

The spectrum of an element

• D.

Interference of light

• 8.
According to the theories of modern physics, light
• A.

Is exclusively a wave phenomenon

• B.

Is exclusively a particle phenomenon

• C.

Combines wave and particle properties

• D.

Has neither wave nor particle properties

• 9.
According to the theories of modern physics,
• A.

Only stationary particles exhibit wave behavior

• B.

Only moving particles exhibit wave behavior

• C.

Only charged particles exhibit wave behavior

• D.

All particles exhibit wave behavior

• 10.
The speed of the wave packet that corresponds to a moving particle is
• A.

Less than the particle's speed

• B.

Equal to the particle's speed

• C.

More than the particle's speed

• D.

Any of these, depending on the circumstances

• 11.
De Broglie waves can be regarded as waves of:
• A.

Pressure

• B.

Probability

• C.

Electric charge

• D.

Momentum

• 12.
The description of a moving body in terms of matter waves is legitimate because:
• A.

It is based upon common sense

• B.

Matter waves have actually been seen

• C.

The analogy with electromagnetic waves is plausible

• D.

Theory and experimental agree

• 13.
The narrower the wave packet of a particle is:
• A.

The shorter its wavelength

• B.

The more precisely its position can be established

• C.

The more precisely its momentum can be established

• D.

The more precisely its energy can be established

• 14.
According to the uncertainty principle, it is impossible to precisely determine at the same time a particle's
• A.

Position and change

• B.

Position and momentum

• C.

Momentum and energy

• D.

Charge and mass

• 15.
If Planck's constant were larger than it is,
• A.

Moving bodies would have shorter wavelengths

• B.

Moving bodies would have higher energies

• C.

Moving bodies would have greater charges

• D.

The uncertainity principle would be significant on a larger scale

• 16.
THe emission spectrum produced by the excited atoms of an element contains frequencies that are
• A.

The same for all elements

• B.

Characteristic of the particular element

• C.

Evenly distributed throughout the entire visible spectrum

• D.

Different from the frequencies in its absorption spectrum

• 17.
A neon sign does not produce
• A.

A line spectrum

• B.

An emission spectrum

• C.

An absorption spectrum

• D.

Photons

• 18.
Most stars are hot objects surrounded by a cooler atmosphere. The spectrum of such a star is a
• A.

Continuous band of light

• B.

Band of light crossed by brighter lines

• C.

Band of light crossed by dark lines

• D.

Series of bright lines

• 19.
The classical model of the hydrogen atom falls because
• A.

An accelerated electron radiates electromagnetic waves

• B.

A moving electron has more mass than an electron at rest

• C.

A moving electron has more charge than an electron at rest

• D.

The attractive force of the nucleus is not enough to keep an electron in orbit around it

• 20.
An electron can revolve in an orbit around an atomic nucleus without radiating energy provided that the orbit
• A.

Is far enough away from the nucleus

• B.

Is less than a de Broglie wavelength in circumference

• C.

Is a whole number of de Broglie wavelengths in circumference

• D.

Is a perfect circle

• 21.
According to the Bohr model of the atom, an electron in the ground state
• A.

• B.

Emits only spectral lines

• C.

Remains there forever

• D.

• 22.
In the Bohr model of the atom, the electrons revolve around the nucleus of an atom so as to
• A.

Emit spectral lines

• B.

Produce x-rays

• C.

Form energy levels that depend upon their speeds only

• D.

Keep from falling into the nucleus

• 23.
A hydrogen atom is said to be in its ground state when its electron
• A.

Is at rest

• B.

Is inside the nucleus

• C.

Is in its lowest energy level

• D.

Has escaped from the atom

• 24.
An atom emits a photon when one of its orbital electrons.
• A.

Jumps from a higher concentration to a lower energy level

• B.

Jumps from a lower to a higher energy level

• C.

Is removed by the photoelectric effect

• D.

Is struck by an x-ray

• 25.
The energy difference between adjacent energy levels in the hydrogen atom.
• A.

Is smaller for small quantum numbers

• B.

Is the same for all quantum numbers

• C.

Is larger for small quantum numbers

• D.

Has no regularity

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