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Planks Theory

Question#1

In which one of the following pairs of experimental observations and phenomenon does the experimental observation correctly account for the phenomenon? Experimental Observation Phenomenon [A IIMS 1983]

X-ray spectra, Charge on the nucleus

Emission spectra, The quantization of energy

The photoelectric effect, The nuclear atom

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Question#2

A metal surface is exposed to solar radiations [DPMT 2005]

The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation

The emitted electrons have zero energy

The emitted electrons have energy equal to energy of photos of incident light

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Question#3

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is [Kera la PMT 2004]

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Question#4

The radius of electron in the first excited state of hydrogen atom is [MP PMT 2004]

a₀

4a₀

2a₀

8a₀

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Question#5

The mass of a photon with a wavelength equal to cm 1.54 x 10^-8 is [Pb. PMT 2004]

0.8268 x 10^-34kg

1.2876 x 10^-33kg

1.4285 x 10^-32kg

1.8884 x 10^-32kg

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Question#6

The frequency of yellow light having wavelength 600 nm is [MP PET 2002]

5.0 x10¹⁴Hz

2.5 x10⁷Hz

5.0 x10⁷Hz

2.5 x10¹⁴Hz

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Question#7

The energy of a radiation of wavelength 8000 Å is E₁ and energy of a radiation of wavelength 16000 Å is E₂ . What is the relation between these two [Kerala CET 2005]

E₁ = 6E₂

E₁ = 2E₂

E₁ = 4E₂

E₁ = 1/2 E₂

E₁ = E₂

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Question#8

Wavelength of spectral line emitted is inversely proportional to

Radius

Energy

Velocity

Quantum number

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Question#9

6.36 x 10³ Å

6.36 x 10⁵ Å

6.64 x 10^-18 Å

6.36 x 10¹⁸ Å

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Question#10

Energy of electron of hydrogen atom in second Bohr orbit is [MP PMT 2000]

- 5.44 x 10^-19J

- 5.44 x 10^-19kJ

- 5.44 x 10^-19cal

- 5.44 x 10^-19eV

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Question#11

The energy of a photon is calculated by [Pb. PMT 2000]

E = hv

h = Ev

h = E / v

E = h / v

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Question#12

Which one of the following is considered as the main postulate of Bohr’s model of atom [A MU 2000]

Protons are present in the nucleus

Electrons are revolving around the nucleus

Centrifugal force produced due to the revolving electrons balances the force of attraction between the electron and the protons

Angular momentum of electron is an integral multiple of h / 2pi

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Question#13

In hydrogen spectrum the different lines of Ly man series are present is [UPSEA T 1999]

UV field

IR field

Visible field

Far IR field

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Question#14

Wavelength associated with electron motion [BHU 1998]

Increases with increase in speed of electron

Remains same irrespective of speed of electron

Decreases with increase in speed of e-

Is zero

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Question#15

What is the packet of energy called [AFMC 2005]

Electron

Photon

Positron

Proton

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Question#16

The wav elength of a spectral line for an electronic transition is inversely related to [IIT 1988]

The number of electrons undergoing the transition

The nuclear charge of the atom

The difference in the energy of the energy levels involv ed in the transition

The v elocity of the electron undergoing the transition

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Question#17

Which one of the following is not the characteristic of Planck's quantum theory of radiation [AIIMS 1991]

The energy is not absorbed or emitted in whole number or multiple of quantum.

Radiation is associated with energy.

Radiation energy is not emitted or absorbed continuously but in the form of small packets called quanta.

This magnitude of energy associated with a quantum is proportional to the frequency.

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Question#18

The ratio of energy of photon of 2000angstrom wavelength to that of 4000angstrom radiation is IIT1986 DCE2000 JIPMER2000

1/4

1/2

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Question#19

The energy of a radiation of wavelength 8000angstrom is E₁ and energy of a radiation of wavelength 16000angstrom is E2. What is the relation between these two Kerala CET-2005

E₁ = 6E₂

E₁ = 2E₂

E₁=4E₂

E₁= 1 / 2E₂

E₁ = E₂

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Question#20

If change in energy (dE =3 x 10^-8h), h=6.64 x 10^-34 Js , c=3 x 10⁸ms^-1then wavelength of the light is CBSE PMT 2000

6.36 x 10³ angstrom

6.36 x 10⁵angstrom

6.64 x10^-8 angstrom

6.36 x10¹⁸ angstrom

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Question#21

A particular station of India Radio, New Delhi broadcast on a frequency of 1,368KHz. The wavelength of the electromagnetic radiation emitted by the transmitter is NEET-2021

219.3m

219.2m

2192m

21.92cm

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Related MCQ's Catrgories

Constituents of atom

Rutherford Model

Planks Theory

Spectrum

Bohr Model

Hydrogen Spectrum

de Broglie relation

Uncertainty principle

Quantum Number

n+l , Auf-Bau, Pauli and Hund's Rule

Quantum mechanical model/ Schrodinger wave equation

Electronic configuration

Properties of canal rays

Home/Atomic StrcuturePlanks Theory

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Question#12

Question#13

Question#14

Question#15

Question#16

Question#17

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Question#19

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Question#21

Home/Atomic Strcuture

Planks Theory