Nature of electromagnetic radiation and photoelectric effect - One Line Questions
1.
If a photon has energy of 5.0 eV and the work function of a metal is 3.0 eV, what is the maximum kinetic energy of the emitted electrons? —
2.0 eV
2.
A metal surface has a threshold frequency of 6.0 x 10^14 Hz. If light of frequency 8.0 x 10^14 Hz is incident on it, what is the kinetic energy of the emitted electrons in Joules? (h = 6.626 x 10^-34 J s) —
1.325 x 10^-19 J
3.
If a metal has a work function of 2.3 eV and is irradiated with light of energy 4.5 eV, what is the maximum kinetic energy of the emitted photoelectrons? —
2.2 eV
4.
If the threshold wavelength for a metal is 500 nm, what is its threshold frequency? (c = 3 x 10^8 m/s) —
6 x 10^14 Hz
5.
What is the approximate value of Planck's constant (h)? —
6.626 x 10^-34 J s
6.
What is the speed of light in vacuum (c)? —
3.00 x 10^8 m/s
7.
The photoelectric effect demonstrates that light behaves as: —
A stream of particles
8.
The photoelectric effect can be observed in metals like: —
Sodium and Potassium
9.
What is the fundamental property of electromagnetic radiation that determines its energy? —
Frequency
10.
The photoelectric effect is a consequence of the interaction between photons and: —
Free electrons in the metal
11.
The photoelectric effect is a key experiment that supports the idea of: —
Quantization of energy
12.
If the intensity of light is increased, while keeping the frequency above the threshold, the number of photoelectrons emitted per second will: —
Increase
13.
If the frequency of incident light is doubled, the kinetic energy of the emitted photoelectrons will: —
More than double
14.
Which equation relates the energy (E) of a photon to its frequency (ν)? —
E = hν
15.
If the frequency of incident light is below the threshold frequency, what happens? —
No electrons are ejected
16.
The work function of a metal is related to the binding energy of electrons to the metal surface. A higher work function means: —
More energy is required to remove an electron.
17.
In the photoelectric effect equation KE = h(ν - ν₀), what does KE represent? —
Maximum kinetic energy of the ejected electron
18.
If light of a certain frequency causes photoemission, increasing the frequency of the light will result in: —
The same number of electrons being emitted, but with higher kinetic energy
19.
The energy of a photon is inversely proportional to its: —
Wavelength
20.
The work function (Φ) can also be expressed as: —
hν₀
21.
The stopping potential in the photoelectric effect is the potential difference required to: —
Prevent any photoelectron from reaching the collector
22.
Which of the following electromagnetic radiations has the highest energy per photon? —
X-rays
23.
The threshold frequency (ν₀) is dependent on the: —
Nature of the metal
24.
The photoelectric effect is the phenomenon where electrons are ejected from a metal surface when: —
It is illuminated by light of suitable frequency
25.
The emission of photoelectrons from a metal surface is a quantum phenomenon because: —
Energy is transferred in discrete packets (photons).
26.
Which of the following is NOT a characteristic of electromagnetic radiation? —
It requires a medium for propagation.
27.
Which property of light is responsible for its ability to cause the photoelectric effect? —
Its particle nature
28.
What is the unit of work function? —
Electronvolt (eV)
29.
When light interacts with matter, energy is transferred in units of: —
Photons
30.
The kinetic energy of the ejected electrons in the photoelectric effect is given by: —
KE = h(ν - ν₀)
31.
The stopping potential (V₀) is related to the maximum kinetic energy (KE_max) by the equation: —
KE_max = eV₀
32.
The intensity of incident light in the photoelectric effect primarily affects the: —
Number of ejected electrons per unit time
33.
The photoelectric effect was experimentally investigated by: —
Heinrich Hertz
34.
What is the minimum frequency of light required to cause the photoelectric effect called? —
Threshold frequency
35.
What is the relationship between the energy of a photon and the work function of a metal in the context of the photoelectric effect? —
Photon energy must be greater than the work function.
36.
In the equation E = hν, what does 'h' represent? —
Planck's constant
37.
In the equation c = λν, what does 'c' represent? —
Speed of light in vacuum
38.
Which of the following metals typically has the lowest work function, making it easier to observe the photoelectric effect? —
Cesium
39.
If the frequency of incident light is less than the threshold frequency, the ejected electrons (if any) would have: —
Zero kinetic energy
40.
Which of the following best describes the energy of a photon of red light compared to a photon of blue light? —
Blue light photon has higher energy.
41.
The term 'work function' (Φ) in the photoelectric effect represents: —
The minimum energy required to remove an electron from the metal surface
42.
Which statement about the photoelectric effect is INCORRECT? —
Emission of electrons is instantaneous upon illumination.
43.
The photoelectric effect provides a direct measurement of: —
Planck's constant
44.
The photoelectric effect provides evidence for the: —
Particle nature of light
45.
Albert Einstein explained the photoelectric effect using the concept of: —
Quantum theory of radiation
46.
The energy of a photon is directly proportional to its: —
Frequency
47.
According to Planck's quantum theory, energy is emitted or absorbed in discrete packets called: —
Quanta
48.
The relationship between wavelength (λ) and frequency (ν) of electromagnetic radiation is: —
c = λν
49.
The threshold wavelength (λ₀) is related to the threshold frequency (ν₀) by: —
λ₀ = c/ν₀