The spectrum produced from an element is:
1. atomic spectrum
2. line spectrum
3. absorption spectrum
4. any one of the above
Which of the following expressions represents the spectrum of Balmer series (If n is the principal quantum number of higher energy level) in Hydrogen atom?
1.
2.
3.
4.
The H-spectrum show:
1. Heisenberg's uncertainty principle
2. Diffraction
3. Polarization
4. Presence of quantized energy level
In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the:
1. Wavelength of incident light.
2. Frequency of incident light.
3. Velocity of incident light.
4. Atomic mass of an element.
Slope of vs v curve is (where =stopping potential, v=subjected frequency)
1.
2.
3.
4.
According to Einstein's photoelectric equation, the graph between kinetic energy of
photoelectrons ejected and the frequency of the incident radiation is:
1.
2.
3.
4.
The photoelectric emission from a surface starts only when the light incident upon the surface has a certain minimum:
1. | Intensity | 2. | Wavelength |
3. | Frequency | 4. | Velocity |
If and be the threshold wavelength and the wavelength of incident light, the velocity of photo-electrons ejected from the metal surface is:
1.
2.
3.
4.
The ratio of slopes of curves in photoelectric effect gives -
(v=frequency, =maximum kinetic energy, stopping potential):
1. Charge of electron
2. Planck's constant
3. Work function
4. The ratio of Planck's constant of electronic charge
The largest de Broglie wavelength among the following (all have equal velocity) is:
1. molecule
2. molecule
3. Electron
4. Proton