The energy of an electron moving in nth Bohr's orbit of an element is given by En=-13.6n2Z2 eV/atom (Z=atomic number). The graph of Evs.Z2 (keeping "n" constant) will be:

1. 2.
3. 4.

Subtopic:  Bohr's Theory |
 51%
Level 3: 35%-60%
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The spectrum produced from an element is:

1. Atomic spectrum

2. Line spectrum

3. Absorption spectrum

4. Any one of the above

Subtopic:  Type of Spectra |
Level 3: 35%-60%
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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.  v¯=Rn-1n+1n2cm-1

2.  v¯=Rn-2n+24n2cm-1

3.  v¯=Rn-2n+2n2cm-1

4.  v¯=Rn-1n+14n2cm-1

Subtopic:  Hydrogen Spectra |
 68%
Level 2: 60%+
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The H-spectrum show:

1.  Heisenberg's uncertainty principle

2.  Diffraction

3.  Polarization

4.  Presence of quantized energy level

Subtopic:  Bohr's Theory |
 75%
Level 2: 60%+
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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.

Subtopic:  Photo Electric Effect |
 84%
Level 1: 80%+
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Slope of V0 vs v curve is (where V0=stopping potential, v=subjected frequency)

1.  e

2.  he

3.  ϕ

4.  h

Subtopic:  Photo Electric Effect |
 76%
Level 2: 60%+
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What is the nature of the graph between the kinetic energy of photoelectrons ejected and the frequency of the incident radiation, based on Einstein's photoelectric equation?
 

1.
2.
3.
4.
Subtopic:  Photo Electric Effect |
 71%
Level 2: 60%+
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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
Subtopic:  Photo Electric Effect |
 75%
Level 2: 60%+
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If λ0 and λ be the threshold wavelength and the wavelength of incident light, the velocity of photo-electrons ejected from the metal surface is:

1.  2hmλ0-λ

2.  2hcmλ0-λ

3.  2hcmλ0-λλλ0

4.  2hm1λ0-1λ

Subtopic:  Photo Electric Effect | Bohr's Theory |
 76%
Level 2: 60%+
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The ratio of slopes of Kmaxvs.vandV0vs.v curves in photoelectric effect gives -

(v=frequency, Kmax=maximum kinetic energy, V0 stopping potential):

1.  Charge of electron

2.  Planck's constant

3.  Work function

4.  The ratio of Planck's constant of electronic charge

Subtopic:  Photo Electric Effect |
Level 3: 35%-60%
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