Kuiz Fizik Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 7 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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

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.

The quantization of atomic energy levels.

None

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

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

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

All particles can exhibit wave-like characteristics.

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

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

No electrons are emitted, regardless of the intensity.

The maximum kinetic energy of the emitted photoelectrons increases.

The number of photoelectrons emitted per second increases

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

Power is inversely proportional to the number of photons emitted.

Power is independent of the number of photons emitted.

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 no electrons would be emitted at all.

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

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

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

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 doubled

It remains the same.

It is halved

It is quadrupled

None

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

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

Because the intensity of the light is not high enough.

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

Because electrons can only absorb energy in discrete packets.

None

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

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.

The total energy of the incident photon.

None

How does Niels Bohr's model of the atom explain the production of line spectra?

Electrons can orbit the nucleus at any distance with any energy.

The nucleus of the atom emits photons when it is excited.

Photons are emitted when electrons transition between discrete energy levels.

Electrons continuously radiate energy as they orbit the nucleus.

None

10.

Which of the following applications directly uses the photoelectric effect to generate an electric current from light?

Solar cells

Electric bells

Electron microscopes

Lasers

None

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