Velocity of helium atom at 300 K is 2.40 x 102 meter per sec. What is its wavelength? (mass number of helium is 4) -

1. 0.416 nm

2. 0.83 nm

3. 803 Å

4. 8000 Å

Subtopic:  EMT Radiation |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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If the Planck’s constant h=6.6 x 10-34 Js, the de-Broglie wavelength of a particle having the momentum of 3.3 x 10-24 kg m s-1 will be

1. 0.002 Å

2. 0.02 Å

3. 0.2 Å

4. 2Å

Subtopic:  Planck's Theory |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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Which of the following statements is not true with respect to photoelectric effect -

1. The plot of kinetic energy of the photoelectrons against frequency of absorbed radiation gives a straight line parallel to x-axis

2. The plot of K.E. of the photoelectrons against frequency of absorbed radiation gives a straight line with slope equal to h and intercept to work function of metal

3. The plot of kinetic energy of the photoelectrons versus the intensity of incident radiation with constant frequency gives a straight line parallel to x-axis

4. When intensity of light is increased the number of photons ejected increases but the energies of these electrons are the same.

Subtopic:  Photo Electric Effect |
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NEET 2022 - Target Batch - Aryan Raj Singh

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The first line in the Lyman series in the spectrum of hydrogen atom occurs at a wavelength of 1215 Å and the limit for Balmer series is 3645 Å. Calculate the wavelength corresponding to series limit of Lyman series.

1. 911.2 Å

2. 812.2 Å

3. 712.2 Å

4. 678.4 Å

Subtopic:  Hydrogen Spectra |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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The order of increasing energies of the orbitals follows:

1. 3s, 3p, 4s, 3d, 4p

2. 3s, 3p, 3d, 4s, 4p

3. 3s, 3p, 4s, 4p, 3d

4. 3s, 3p, 3d, 4p, 4s

Subtopic:  AUFBAU Principle |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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In Rutherford's alpha scattering experiment using gold foil, the kinetic energy of the alpha particle was 1.2 x 10-12J. For a head on collision, using the formula K.E. = 14πε0x 2Ze2/r0 , what may be the magnitude of r0 [ The nuclear radius of gold, Z=79; 14πε0= 9 x 109 new-ton/meter2 coulomb-2, e= 1.6x10-19 coulomb]

1. 3 x 10-14m

2. 1.3 x 10-14m

3. 2.1 x 10-14m

4. 4.3 x 10-14m

Subtopic:  Introduction of Atomic Structure |
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NEET 2022 - Target Batch - Aryan Raj Singh

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The quantum numbers of most energetic electron in Ne atom in first excited state is

1. 2, 1, 0, +1/2

2. 3, 1, 1, +1/2

3. 3, 0, 0, +1/2

4. 3, 1, 0, +1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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The frequency of line spectrum of sodium is 5.09 x 1014 sec-1. Its wavelength (in nm) will be -[C= 3x108m/sec]

1. 510nm

2. 420nm

3. 589nm

4. 622nm

Subtopic:  EMT Radiation |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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The total number of neutrons in dipositive zinc ions with mass number 70 is -

1. 34

2. 40

3. 36

4. 38

Subtopic:  Number of Electron,Proton & Neutron |
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NEET 2022 - Target Batch - Aryan Raj Singh

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With a certain exciting radiation of a particular frequency, to which hydrogen atoms are exposed, the maximum number of spectral lines obtainable in the emission is 15. The uppermost energy level to which the electron is excited is 

1. 4

2. 5

3. 6

4. 7

Subtopic:  Hydrogen Spectra |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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