Kuiz Fizik Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 7 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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.

Electrons continuously radiate energy as they orbit the nucleus.

Photons are emitted when electrons transition between discrete energy levels.

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

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

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

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

Power is independent of the number of photons emitted.

Power is inversely proportional to the number of photons emitted.

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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.

All particles can exhibit wave-like characteristics.

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.

None

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

Electric bells

Electron microscopes

Lasers

Solar cells

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

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.

The kinetic energy of the emitted electron

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

The radiation spectrum of a black body.

The diffraction of light through a narrow slit.

The interference pattern from a double-slit experiment.

The reflection of light from a smooth surface.

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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)?

No electrons are emitted, regardless of the intensity.

The number of photoelectrons emitted per second increases

The maximum kinetic energy of the emitted photoelectrons increases.

The number of photoelectrons emitted per second increases

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Which of these scientists is credited with conducting the double-slit experiment in 1801, demonstrating that light behaves as a wave?

Max Planck

Thomas Young

J. J. Thomson

Isaac Newton

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

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

Because electrons can only absorb energy in discrete packets.

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.

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10.

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 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.

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

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