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WorksheetsPRIBADI DEPOK QUANTUM PHYSICS
Total questions: 10
Worksheet time: 5mins
Photoelectrons will be ejected from a material surface if?
The threshold frequency is greater than the photon frequency
The work function is less than the photon energy
The intensity of light is high enough
The wavelength of photon is maximum
A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.
4.2 eV
4.4 eV
4.7 eV
4.9 eV
In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons
Will not be ejected
Will be ejected as observed in the previous
Will be ejected with greater number of photoelectrons
Will be ejected with greater kinetic energy
A metal surface with a work function of W0 = hc/550 nm is struck with blue light and electrons are released. If the blue light is replaced by red light of the same intensity, what is the result?
No electrons are emitted
Fewer electrons are emitted in a given time interval
Emitted electrons are less energetic
Emitted electrons are more energetic
A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?
More electrons are emitted in a given time interval
Fewer electrons are emitted in a given time interval
Emitted electrons are more energetic
Emitted electrons are less energetic
A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?
More electrons are emitted in a given time interval
Fewer electrons are emitted in a given time interval
Emitted electrons are more energetic
Emitted electrons are less energetic
A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?
The red beam
The violet beam
The number of photons per second is the same for both beams
This cannot be answered without knowing just what the light intensity
In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle
Increases.
Decreases
Does not change
Varies randomly
Determine the ratio of photon’s energy of a monochromatic ray with 6000 Å Wavelength and 4000 Å wavelength!
1:2
2:3
1:3
2:4
An object that is vibrating by frequency 4 x1015 Hz. What is the vibrating energy of that object according to Planck’s quantum theory?
26.5 x 10-19 J
28.7 x 10-19J
29.7 x 10-19 J
32.6 x 10-19 J
