Kuiz Fizik Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 7 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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.

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 halved

It is doubled

It is quadrupled

It remains the same.

None

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

All particles can exhibit wave-like characteristics.

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.

None

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

Electron microscopes

Solar cells

Lasers

Electric bells

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 inversely proportional to the number of photons emitted.

Power is independent of the number of photons emitted.

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.

None

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

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

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.

None

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

Because the intensity of the light is not high enough.

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.

None

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

The quantization of atomic energy levels.

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

The creation of energy from a photon.

The law of conservation of energy for the photoelectric effect.

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 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.

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

None

10.

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

Photons

Electrons

Corpuscles

None

1 out of 10