List of top Chemistry Questions on Photoelectric Effect asked in KEAM

The work function of a material that has the threshold frequency of \(5 \times 10^{14} \, Hz\) is (\(h = 6.626 \times 10^{-34}\) Js).
The minimum energy required to remove an electron from sodium atom is $3.313 \times 10^{-19}J$. What is the maximum wavelength of radiation that will eject photoelectron from sodium metal? ($h = 6.626 \times 10^{-34}Js$)
If the threshold wavelengths of two metals are in the ratio $1:3$, then the work functions of these metals are in the ratio
A 250 watt bulb emits monochromatic light wavelength 198.78 nm. How many photons are emitted by the bulb per second?
Find difference in work function of two different metal if their stopping potential are 0.4V and 1.6V respectively.(metals are illuminated with photons of same energy)
A 250W bulb emit light of wavelength 19.6nm. Find the no of electron emitted per second
Minimum energy required to remove an atom from sodium is \( 3.313 \times 10^{-19} \text{g.} \) Maximum wavelength of radiation that will get photoelectron
Above the threshold frequency, if the intensity of incident light falling on a photo sensitive material is increased, then the correct statement is:
Which one of the following statements is INCORRECT regarding the photoelectric effect?
If the threshold wavelength of a photoelectric material lies in the green light region, then which one of the following light will not emit photoelectrons?
A 150 watt bulb emits monochromatic light of wavelength 662 nm. How many number of photons emitted per second by the bulb? (Planck's constant, \(\mathrm{h} = 6.62 \times 10^{- 34} \mathrm{~J} \mathrm{~s}, \mathrm{~c} = 3 \times 10^{8} \mathrm{~m} \mathrm{~s}^{- 1}\))
If light waves of wavelengths \(\lambda\) and \(\lambda/3\) are incident on the surface of a material, photoelectrons are emitted with maximum kinetic energy E and 4E respectively, then the work function of the material is
If light waves of wavelengths \(\lambda\) and \(\lambda/3\) are incident on the surface of a material, photoelectrons are emitted with maximum kinetic energy \(E\) and \(4E\) respectively, then the work function of the material is
When blue light is incident on a certain metal surface, photoelectrons are emitted. When green light is incident on the same metal surface, no electrons are emitted. If the same metallic surface is exposed to yellow light,
Among the following photosensitive substances, the one which emits electrons when it is illuminated by visible light is
Maximum number of photons emitted by a bulb capable of producing monochromatic light of wavelength 550 nm is ______, if 100 V and 1 A is supplied for one hour.
A monochromatic light of frequency \( \nu = \frac{1}{6.63} \times 10^{16} \) Hz is produced by a laser. The power emitted is \( P = 10^{-2} \) W. The average number of photons per second emitted by the source is
The work function of three photosensitive materials are: Sodium (2.75 eV), copper (4.65 eV) and gold (5.1 eV). Which of the following statements is correct (Visible light range: $4 \times 10^{14}$ Hz to $8 \times 10^{14}$ Hz)?
If the work functions of three photosensitive materials are 1 eV, 2 eV and 3 eV respectively, then the ratio of threshold frequencies of light that produce photoelectrons of maximum kinetic energy of 1 eV from each of them is
The threshold frequency of a metal corresponds to the wavelength of \(x\) nm. In two separate experiments ‘A’ and ‘B’, incident radiations of wavelengths \(\frac{x}{2}\) nm and \(\frac{x}{4}\) nm respectively are used. The ratio of kinetic energy of the released electrons in experiment ‘B’ to that in experiment ‘A’ is
The work function of a metal is 5 eV. What is the kinetic energy of the photoelectron ejected from the metal surface if the energy of the incident radiation is 6.2 eV? ($1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}$)
A 250 W electric bulb of 80% efficiency emits a light of 6626 \AA wavelength. The number of photons emitted per second by the lamp is ($h = 6.626 \times 10^{-34}$ Js)
A 250 W electric bulb of 80% efficiency emits a light of 6626 \AA wavelength. The number of photons emitted per second by the lamp is ($h = 6.626 \times 10^{-34}$ Js)
The work function of a metal is 5 eV. What is the kinetic energy of the photoelectron ejected from the metal surface if the energy of the incident radiation is 6.2 eV? ($1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}$)
A 250 W electric bulb of 80% efficiency emits a light of 6626 \AA wavelength. The number of photons emitted per second by the lamp is ($h = 6.626 \times 10^{-34}$ Js)