Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

Calculate the wavelength of photon having energy 5 e.v.

A
$$2 . 74\times 10^{-6} cm$$

B
$$2 . 74\times10^{-5} cm$$

C
$$2 . 74\times10^{-7} cm$$

D
$$2 . 74\times10^{-8} cm$$

Solution
Question 2
1 / -0

An electron from various excited states of hydrogen atom emit radiation to come to the ground state.. $$ \lambda_n, \lambda_n, \lambda_g $$ be the de Broglie wavelength of the electron in the $$ n^{th} $$ state and the ground state respectively. Let $$ \Lambda_n $$ be the wavelength of the emmited photon in the transition from the $$ n^{th} $$ state to the ground state.For large n, (A,B are constants)

A
$$ \Lambda _ n\quad \approx \quad A\quad +\frac { B }{ \lambda _ n^ 2 } $$

B
$$ \Lambda _ n\quad \approx \quad A\quad +B\lambda _ n $$

C
$$ \Lambda _ n^ 2\quad \approx \quad A\quad +B\lambda _ n^ 2 $$

D
None of these

Solution
Question 3
1 / -0

If the wavelength of an electromagnetic radiation is 2000$$\overset {o}A$$
A. What is the energy in ergs?

A
$$9.94\times 10^{-12}$$

B
$$9.94 \times 10^{-10}$$

C
$$4.97\times 10^{-12}$$

D
$$4.97 \times 10^{-19}$$

Solution
Question 4
1 / -0

Calculate energy of one mole of photons of radiation whose frequency is $$5\times 10^{14}Hz$$.

A
150 kJ $$mol^{-1}$$

B
180 kJ $$mol^{-1}$$

C
195 kJ $$mol^{-1}$$

D
199.5 kJ $$mol^{-1}$$

Solution
Question 5
1 / -0

A certain metal when irradiated by light ($$(v=3.2 \times 10^{16}HZ)$$ emits photoelectrons with twice K. E. as did photoelectrons when the same metal is irradiated by light $$(v=2 \times 10^{16}HZ)$$. The $$V_{0}$$ of the neutral is

A
$$v= 1.2 \times 10^{16}Hz$$

B
$$v= 8 \times 10^{15}Hz$$

C
$$v= 1.4 \times 10^{16}Hz$$

D
$$v= 4 \times 10^{12}Hz$$

Solution
Question 6
1 / -0

What is the ratio of the De-Broglie wave lengths for electrons accelerated through 200 volts and 50 volts _____.

A
1:2

B
2:1

C
3:10

D
10:3

Solution
Question 7
1 / -0

Assertion : The de Broglie wavelength of electron increases as the accelerating potential difference decreases.
Reason: The magnitude of charge on electron decreases with decreasing accelerating potential difference.

A
A

B
B

C
C

D
D

Solution
Question 8
1 / -0

The frequency and wavelength of radiation which has energy of 5 eV is

A
$$1.2 \times 10^{15}\ Hz, 2848\ \overset { \circ }{ A } $$

B
$$1.2 \times 10^{13}\ Hz, 2488\ \overset { \circ }{ A } $$

C
$$1.2 \times 10^{15}\ Hz, 2488\ \overset { \circ }{ A } $$

D
$$2.1 \times 10^{15}\ Hz, 2488\ \overset { \circ }{ A } $$

Solution
Question 9
1 / -0

If change in energy:- $$\Delta E=3 \times { 10 }^{ -8 }J, \quad h=6.64 \times { 10 }^{ -64 } J-s\: and\: c=3\times{ 10 }^{ 8 }m/s$$ then wavelength of the light in $$mtrs$$ is:

A
$$6.64 \times { 10 }^{ 3 } $$

B
$$6.64 \times { 10 }^{ 5} $$

C
$$6.64 \times { 10 }^{ -8 } $$

D
$$6.64 \times { 10 }^{ 18 }$$

Solution
Question 10
1 / -0

If the radius of 1st bohr's orbit x then the de broglie's wavelength of $${ e }^{ \circleddash }$$ in 3rd orbit is nearly equal to

A
2$$\pi $$x

B
9$$\pi $$x

C
9x

D
6$$\pi $$x

Solution