Which color of light moves at the fastest speed?

All light travels at the same speed.

Planck's constant can be found ...

energy of a particle x wavelength / speed of light

energy of a particle x speed of light / wavelength

energy of a particle x speed of light / frequency of light

slope of the cut-off voltage vs frequency graph

relates the momentum of a mass to its wavelength

relates the energy of a mass to its wavelength

relates the frequency of a mass to its wavelength

relates the work function of a mass to its wavelength

The energy of an emitted photon can be calculated from ...

Plancks constant x frequency of the photon

h x c / wavelength of the light emitted

the difference in the energy levels

Which of the following is NOT a principle of the Bohr Model of the atom?

Photons are emitted when electrons move into higher energy levels

The energy of the orbiting electrons is quantised

Centripetal force on electrons is provided by electrostatic attraction

Spectral lines are a result of fixed energy levels

Which of the following statements about this diagram is UNTRUE ?

Electron levels n =1 to n = 4 represent excited electron states

The values shown in electron-volts follow a geometric progression of the form E n = E 1 /n 2

At energy level n = ∞ there is no attractive force between the nucleus and the electron

All electron level energies have negative values – this denotes stability of orbits

Match the spectrum type on the left with the correct conditions of formation:

a with z, b with x and c with y

a with y, b with x and c with z

This diagram shows the original set-up to demonstrate the photoelectric effect. When light of a certain frequency was shone onto a negatively charged zinc plate the charge disappeared after a short time. Which of the following statements about the photoelectric effect is NOT true?

For any wavelengths of light used electrons will be emitted to some extent

The Work Function of zinc equals the minimum energy needed to just eject an electron

The photoelectric effect can only be explained if a Particle Model for light is used

This experiment would not have worked if the charge on the zinc plate had been positive

The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent. Which of the following changes could cause the photocurrent to stop?

Increasing the potential difference of the power supply

Increasing the frequency of the UV light

Increasing the intensity of the UV light

Changing the metal surface to one with a smaller work function

Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.

Rate of electron emission: increase Energy of electrons: no change

Rate of electron emission: increase Energy of electrons: increase

Rate of electron emission: decrease Energy of electrons: no change

Rate of electron emission: decrease Energy of electrons: increase

Which statement about the photoelectric effect is correct?

Electrons are emitted instantaneously

Electrons are always emitted for all wavelengths

You can change the energy of the electrons by changing the intensity

Electron energy is independent of frequency

Which phenomenon of Black body radiation is shown here?

The peak intensity wavelength is proportional to T -1

Blue light is the longest wavelength

The Power of the light is proportional to T 4

Quantum Mechanics Electromagnetic Spectrum

Authored by Charles Martinez

Physics

11th - 12th Grade

NGSS covered

Quantum Mechanics Electromagnetic Spectrum

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40 questions

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Photoelectrons will be ejected from a material surface if?

The threshold frequency is greater than the photon frequency

The work function is less than the photon energy

The intensity of light is high enough

The wavelength of photon is maximum

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

4.2 eV

4.4 eV

4.7 eV

4.9 eV

Tags

NGSS.HS-PS4-3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

Will not be ejected

Will be ejected as observed in the previous

Will be ejected with greater number of photoelectrons

Will be ejected with greater kinetic energy

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

More electrons are emitted in a given time interval

Fewer electrons are emitted in a given time interval

Emitted electrons are more energetic

Emitted electrons are less energetic

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?

More electrons are emitted in a given time interval

Fewer electrons are emitted in a given time interval

Emitted electrons are more energetic

Emitted electrons are less energetic

Tags

NGSS.HS-PS4-3

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

True or False? The wavelength and frequency of all waves are inversely proportional to each other.

True

False

Tags

NGSS.HS-PS4-1

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of the following colors of visible light has the highest frequency?

Blue

Green

Red

Tags

NGSS.HS-PS4-1

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Quantum Mechanics Electromagnetic Spectrum

Photoelectrons will be ejected from a material surface if?

A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?

True or False? The wavelength and frequency of all waves are inversely proportional to each other.

Which of the following colors of visible light has the highest frequency?

Which of the following colors of visible light has the lowest frequency?

Which of the following colors of visible light has the longest wavelength?

Which color of light moves at the fastest speed?

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