Atoms Test

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Atoms Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

The diagram below shows a cathode ray tube in which the arrow indicates a beam of charged particles approaching an electric field between the plates A and B. What will happen to the beam when it passes through the electric field?

A
Will pass undeflected

B
Will deflect towards B

C
Will have circular motion in between A and B

D
Will deflect towards A

Solution

Cathode Ray Tube (CRT) is an apparatus used as a display device in televisions and computers. It is essentially made up of 4 parts:
1. Electron Gun
2. Focussing and Accelerating Anodes
3. Horizontal and Vertical Deflection Plates
4. Evacuated Glass Envelopes
Electron gun is used to produce stream of charged electrons. Since, the beam is a stream of charged electrons, it will be deflected towards A (positively charged plate)
Question 2
1 / -0

In Bohr's model of the hydrogen atom, let $$R, V, T$$ and $$E$$ represent the radius of the orbit, speed of the electron, time period of revolution of electron and the total energy of the electron respectively. The quantity proportional to the quantum number n is

A
$$VR$$

B
$$E$$

C
$$r$$

D
$$T$$

Solution

$$\displaystyle R \propto n^2$$
$$\displaystyle V \propto \frac{1}{n}$$

So, $$VR$$ is $$\propto n$$

$$\displaystyle T \propto n^3 \Rightarrow E \propto \frac{1}{n^2}$$
Question 3
1 / -0

Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?

A
Paschen series

B
Balmer series

C
Lyman series

D
Brackett series

Solution

Transition from higher states to $$n=2$$ lead to emission of radiation with wavelengths $$656.3 nm$$ and $$365.0 nm$$. These wavelengths fall in the visible region and constitute the Balmer series.
Question 4
1 / -0

Hydrogen atom excites energy level from fundamental state to $$n = 3$$. Number of spectral lines, according to Bohr, is

A
$$4$$

B
$$3$$

C
$$1$$

D
$$2$$

Solution

No. of spectral lines $$ = \displaystyle \frac{n(n-1)}{2}=\frac{3(3-1)}{2}=3$$
Question 5
1 / -0

The approximate value of quantum number $$n$$ for the circular orbit of hydrogen $$0.0001 mm$$ diameter is

A
$$1000$$

B
$$60$$

C
$$10000$$

D
$$31$$

Solution

$$\displaystyle r=0.528n^2 \times 10^{-10}$$

$$\displaystyle \left(\frac{1 \times 10^{-7}}{2}\right)=0.528n^2 \times 10^{-10}$$

$$\displaystyle \Rightarrow n^2=\frac{5 \times 10^{-8}}{0.528 \times 10^{-10}} \Rightarrow n \approx 31$$
Question 6
1 / -0

Of the following properties, the photon does not process

A
Rest mass

B
Momentum

C
Energy

D
Frequency

Solution

A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Question 7
1 / -0

In an electron gun the control grid is given a negative potential relative to cathode in order to

A
Decelerate electrons

B
Repel electrons and thus to control the number of electrons passing through it

C
To select electrons of same velocity and to converge them along the axis

D
To decrease the kinetic energy of electrons

Solution

You must know the working of an electron gun.
In an electron gun the control grid is given a negative potential relative to cathode in order to repel electrons and thus to control the number of electrons passing through it.
Question 8
1 / -0

The energy levels of the hydrogen spectrum is shown in figure. There are some transitions $$A, B, C, D$$ and $$E$$. Transition $$A, B$$ and $$C$$ respectively represent

A
first member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series

B
ionization potential of hydrogen, second spectral line of Balmer series, third spectral line of Paschen series

C
series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series

D
series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series

Solution

Transition $$A = \left(n = \infty to 1\right)$$ : Series line of Lyman series
Transition $$B = \left(n = 5 to n = 2\right)$$ : Third spectral line of Balmer series
Transition $$C = \left(n = 5 to n = 3\right)$$ : Second spectral line of Paschen series
Question 9
1 / -0

A photon is a/an

A
Quantum of light

B
Quantum of matter

C
Positively charged paticle

D
Instrument for measuring light intensity

Solution
Question 10
1 / -0

Hydrogen atom excites energy level from fundamental state to $$n=3$$. Number of spectral lines according to Bohr, is

A
$$4$$

B
$$3$$

C
$$1$$

D
$$2$$

Solution

No. of lines, $$\displaystyle N_E=\frac{n(n-1)}{2}=\frac{3(3-1)}{2}=3$$

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Re-Attempt Weekly Quiz Competition

Atoms Test - 35

Result

Atoms Test - 35

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SHARING IS CARING

Question 1

Will pass undeflected

Will deflect towards B

Will have circular motion in between A and B

Will deflect towards A

Solution

Question 2

$$VR$$

$$E$$

$$r$$

$$T$$

Solution

Question 3

Paschen series

Balmer series

Lyman series

Brackett series

Solution

Question 4

$$4$$

$$3$$

$$1$$

$$2$$

Solution

Question 5

$$1000$$

$$60$$

$$10000$$

$$31$$

Solution

Question 6

Rest mass

Momentum

Energy

Frequency

Solution

Question 7

Decelerate electrons

Repel electrons and thus to control the number of electrons passing through it

To select electrons of same velocity and to converge them along the axis

To decrease the kinetic energy of electrons

Solution

Question 8

first member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series

ionization potential of hydrogen, second spectral line of Balmer series, third spectral line of Paschen series

series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series

series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series

Solution

Question 9

Quantum of light

Quantum of matter

Positively charged paticle

Instrument for measuring light intensity

Solution

Question 10

$$4$$

$$3$$

$$1$$

$$2$$

Solution

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