The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volt is equal to 

1. eVhc 

2. ehcV 

3. hceV 

4. cVeh

Subtopic:  X-Ray (OLD NCERT) |
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The graph between the square root of the frequency of a specific line of the characteristic spectrum of X-rays and the atomic number of the target will be:

1.

2. 

3. 

4. 

Subtopic:  X-Ray (OLD NCERT) |
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The wavelength of Kα X-rays for lead isotopes Pb208, Pb206, Pb204 are λ1, λ2 and λ3 respectively. Then

1. λ1=λ2>λ3   

2. λ1>λ2>λ3

3. λ1<λ2<λ3 

4. λ2=λ1=λ3

Subtopic:  X-Ray (OLD NCERT) |
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which of the following is positively charged?

1.  α-particles  

2.  β-particles  

3.  γ-rays  

4.  X-rays

Subtopic:  X-Ray (OLD NCERT) |
 85%
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A X-ray tube operates at an accelerating potential of 20 kV. Which of the following wavelength will be absent in the continuous spectrum of X-rays?

1.  12 pm

2.  75 pm

3.  65 pm

4.  95 pm

Subtopic:  X-Ray (OLD NCERT) |
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The longest and shortest wavelength of the Lyman series are (respectively)

1.  1215 A0, 500 A0   

2.  1215 A0, 912 A0  

3.  912 A0, 500 A0   

4.  912 A0, 700 A0

Subtopic:  Spectral Series |
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Bragg's law for X-rays is:

1. dsinθ = 2nλ 

2. 2dsinθ = nλ

3. nsinθ = 2λd

4. None of these

Subtopic:  X-Ray (OLD NCERT) |
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To explain his theory, Bohr used

1. conservation of linear momentum

2. conservation of angular momentum

3. conservation of quantum  frequency

4. conservation of energy

Subtopic:  Bohr's Model of Atom |
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Hydrogen \({}_{1}\mathrm{H}^{1}\), Deuterium \({}_{1}\mathrm{H}^{2}\), singly ionised helium \(\left({}_{2}\mathrm{He}^{4}\right)^+\), and doubly ionised lithium\(\left({}_{3}\mathrm{Li}^{6}\right)^{+++}\) all have one electron around the nucleus. Consider an electron transition from \(n=2\) to \(n=1\). If the wavelengths of emitted radiations are \(\lambda_1, \lambda_2, \lambda_3~\text{and}~\lambda_4\) respectively, then approximately which one of the following is correct?
1. \(4 \lambda_1=2 \lambda_2=2 \lambda_3=\lambda_4\)
2. \( \lambda_1=2 \lambda_2=2 \lambda_3=\lambda_4\)
3. \( \lambda_1=\lambda_2=4 \lambda_3=9\lambda_4\)
4. \( \lambda_1=2\lambda_2=3 \lambda_3=\lambda_4\)

Subtopic:  Bohr's Model of Atom |
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In an experiment to determine the e/m value for an electron using Thomson's method the electrostatic deflection plates were 0.01 m apart and had a potential difference of 200 volts applied. Then the electric field strength between the plates is 

1. 1×104 V/m 

2. 2×104 V/m

3. 4×104 V/m 

4. 5×105 V/m

Subtopic:  Various Atomic Models |
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