Atoms Test

Result

Atoms Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Cathode rays ___________.

A
Are the atoms moving toward the cathode

B
Are electromagnetic waves

C
Are negative ions travelling from cathode to anode

D
Are electrons emitted by cathode and travelling towards anode

Solution

Cathode rays are a beam of electrons emitted from the cathode of a high-vacuum tube.
Cathode rays are negatively charged and hence they move towards positively charged ions hence they move towards anode.
Therefore the correct option is (D).
Question 2
1 / -0

An electron jumps from $$6^{th}$$ shell in an hydrogen atom, the number of Lyman emission lines will be:

A
5

B
6

C
10

D
12

Solution

From level 6 to level 1 i,e,
$$6 \rightarrow 1$$
and $$5 \rightarrow 1$$
$$4 \rightarrow 1$$
$$3 \rightarrow 1$$
$$2\rightarrow 1$$
So total 5 lines in Lyman series.
Question 3
1 / -0

What is the wavelength of the most energetic photon emitted in the Balmer's series of the hydrogen atom?

A
$$3694 \ A$$

B
$$5756 \ A$$

C
$$3333 \ A$$

D
$$3669 \ A$$

Solution

Balmer series means wavelength is given by $$\dfrac{1}{\lambda}=R(\dfrac{1}{4}-\dfrac{1}{n^2})$$
for maximum wavelength the $$n$$ should be max so putting $$n\rightarrow \infty$$
we get $$\lambda=\dfrac{4}{R}$$
putting the Rydberg's constant as $$R=1.09\times 10^{7} /m$$

we get $$\lambda= 3669\times 10^{-10}meter=3669Angstrom$$
Question 4
1 / -0

'Electrons revolve round the nucleus in well-defined orbits, like planets revolve round the sun' was the brainchild of.

A
Arnold Sommerfeld

B
Max Born

C
Ernest Rutherford

D
Niels Bohr

Solution

$$\begin{array}{l}\text { Electron revolves around the nucleus in wall-defined } \\\text { orbits, like planets revolve around the sun was } \\\text { the brainchild of Niels Bohr. }\end{array}$$
Question 5
1 / -0

Cathode rays are passing through a discharge tube. In the tube, there is

A
an electric field but no magnetic field

B
a magnetic field but no electric field

C
an electric as well as a magnetic field

D
neither an electric nor a magnetic field.

Solution

Cathode ray consists of beams of electrons that constitute current and, hence magnetic field. We know electric field is produced by a charge, whether it is stationary or moving. So electric field will also be present inside the tube.
Question 6
1 / -0

Which one of the following device makes use of the electrons to strike certain substances to produce fluorescence?

A
Thermionic value

B
Photoelectric cell

C
Cathode ray oscilloscope

D
Electron gun

Solution

The device which makes use of the electrons to strike certain substances to produce fluorescence is Cathode ray oscilloscope.
Question 7
1 / -0

The number of significant figure in $$6.023 \times 10 ^ { 23 } \mathrm { mole } ^ { - 1 }$$ is

A
4

B
3

C
2

D
23

Solution

The number of significant figure in $$6.023\times { 10^{ 23 } }{ { mol } }{ { { e } }^{ -1 } }$$ is $$as\, Avogadros\quad number\, ,\, 4\, \quad is\quad \, significant\, \quad figures$$
so the corecct option is A.
Question 8
1 / -0

To which of the following the angular velocity of the electron in the n-th Bohr orbit is proportional ?

A
$$n^2$$

B
$$\dfrac{1}{n^2}$$

C
$$\dfrac{1}{n^{\dfrac{3}{2}}}$$

D
$$\dfrac{1}{n^3}$$

Solution

$$L=mr^2\omega=\dfrac{nh}{2\pi},\omega \propto \dfrac{n}{r^2}$$
$$,\omega\propto \dfrac{n}{(r_0n^2)^2},\omega\propto \dfrac{1}{n^3}$$
Question 9
1 / -0

Cathode rays constitute a stream of

A
electrons

B
protons

C
positive ions

D
negative ions.

Solution

Cathode ray consists of fast moving charged particle. When electric and magnetic fields are applied to the cathode ray in the discharge tube, the rays are deflected thus establishing that they consist of charged particles. the direction of deflection show that cathode rays consist of negatively charged particle called electrons.
Question 10
1 / -0

Two photons having _________________.

A
Equal wavelengths have equal linear momenta

B
Equal energies have equal linear momenta

C
Equal frequencies have equal linear momenta

D
Equal linear momenta have equal wavelengths

Solution

The correct option is (4).
Equal linear momenta have equal wavelengths.

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Re-Attempt Weekly Quiz Competition

Atoms Test - 23

Result

Atoms Test - 23

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SHARING IS CARING

Question 1

Are the atoms moving toward the cathode

Are electromagnetic waves

Are negative ions travelling from cathode to anode

Are electrons emitted by cathode and travelling towards anode

Solution

Question 2

5

6

10

12

Solution

Question 3

$$3694 \ A$$

$$5756 \ A$$

$$3333 \ A$$

$$3669 \ A$$

Solution

Question 4

Arnold Sommerfeld

Max Born

Ernest Rutherford

Niels Bohr

Solution

Question 5

an electric field but no magnetic field

a magnetic field but no electric field

an electric as well as a magnetic field

neither an electric nor a magnetic field.

Solution

Question 6

Thermionic value

Photoelectric cell

Cathode ray oscilloscope

Electron gun

Solution

Question 7

4

3

2

23

Solution

Question 8

$$n^2$$

$$\dfrac{1}{n^2}$$

$$\dfrac{1}{n^{\dfrac{3}{2}}}$$

$$\dfrac{1}{n^3}$$

Solution

Question 9

electrons

protons

positive ions

negative ions.

Solution

Question 10

Equal wavelengths have equal linear momenta

Equal energies have equal linear momenta

Equal frequencies have equal linear momenta

Equal linear momenta have equal wavelengths

Solution

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