Kuiz Fizik Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 7 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

What is the 'work function' (W) in the context of the photoelectric effect?

The total energy of the incident photon.

The kinetic energy of the emitted electron

The frequency of the incident light.

The minimum energy required to release an electron from a metal surface.

None

What is the relationship between the power (P) of a light source and the number of photons (n) it emits per second?

Power is equal to the number of photons emitted per second multiplied by the energy of each photon.

Power is inversely proportional to the number of photons emitted.

Power is independent of the number of photons emitted.

Power is the energy of a single photon divided by the number of photons.

None

According to the relationship E=hf, if the frequency of a light wave is doubled, what happens to the energy of a single photon of that light?

It is quadrupled

It remains the same.

It is halved

It is doubled

None

A key feature of the photoelectric effect is that photoelectrons are emitted almost instantaneously when light shines on the metal (if f>f 0). Why did this observation conflict with classical wave theory?

Classical theory predicted that electrons would be emitted randomly, not instantaneously.

Classical theory predicted that it would take time for an electron to absorb enough energy from a continuous wave to be ejected.

Classical theory predicted that no electrons would be emitted at all.

Classical theory predicted that only very high-frequency light could ever cause emission.

None

The concept of wave-particle duality, introduced by Louis de Broglie, suggests that:

Only massless entities like photons can exhibit both wave and particle properties.

Wave properties and particle properties are mutually exclusive and can never be observed for the same entity.

Light behaves only as a wave, and particles like electrons behave only as particles.

All particles can exhibit wave-like characteristics.

None

Which phenomenon could not be explained by classical wave theory but was successfully explained by Max Planck's quantum theory?

The diffraction of light through a narrow slit.

The reflection of light from a smooth surface.

The radiation spectrum of a black body.

The interference pattern from a double-slit experiment.

None

In the photoelectric effect, what happens if the intensity of the incident light is increased while the frequency remains the same (and above the threshold frequency)?

The number of photoelectrons emitted per second increases

The maximum kinetic energy of the emitted photoelectrons increases.

No electrons are emitted, regardless of the intensity.

The number of photoelectrons emitted per second increases

None

Einstein's photoelectric equation is given by hf=W+K max . What does this equation represent?

The quantization of atomic energy levels.

The law of conservation of energy for the photoelectric effect.

The relationship between a particle’s momentum and its wavelength.

The creation of energy from a photon.

None

Albert Einstein expanded on Max Planck's quantum theory by proposing that light itself exists in discrete packets of energy. What are these packets called?

Quanta

Corpuscles

Electrons

Photons

None

10.

Why does a 'threshold frequency' exist for the photoelectric effect?

Because classical wave theory predicts a time delay for low frequencies.

Because the incoming photon must have enough energy to overcome the metal’s work function.

Because electrons can only absorb energy in discrete packets.

Because the intensity of the light is not high enough.

None

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