Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Minimum wavelength for transition in visible region for $$Li^{2+}$$ will be given by $$(R_H\longrightarrow Rydberg's Constant)$$

A
$$\cfrac{4}{R_H}$$

B
$$\cfrac{9}{5R_H}$$

C
$$\cfrac{4}{9R_H}$$

D
$$\cfrac{5}{R_H}$$

Solution
Question 2
1 / -0

The wavelength of the radiation emitted,when in a hydrogen atom electron falls from infinity to stationary state 1,would be (Rydberg constant=$$1.097 \times 10^{7}m^{-1}$$

A
$$9.1 \times 10^{-8} nm$$

B
$$192nm$$

C
$$406nm$$

D
$$91nm$$

Solution
Question 3
1 / -0

An electron has kinetic energy $$2.8 \times 10^{-23}$$j. de-Broglie wavelength will be nearly:
$$(m_e=9.1 \times 10^{-31}kg)$$

A
$$9.28 \times 10^{-24}$$m

B
$$9.28 \times 10^{-7}$$m

C
$$9.28 \times 10^{-8}$$m

D
$$9.28 \times 10^{-10}$$m

Solution
Question 4
1 / -0

Based on the equation
$$\triangle E=-2.0\times 10^{-18}J(\cfrac 1 {n_2^2}-\cfrac1 {n_1^2})$$
the wavelength of the light that must be absorbed to excite hydrogen electron from level $$n=1 \quad to\quad level\quad n=2 \quad will\quad be(h=6.625 \times 10^{-34}Js,C=3 \times 10^8ms^{-1})$$

A
$$2.650 \times 10^{-7}m$$

B
$$1.325 \times 10^{-7}m$$

C
$$1.325 \times 10^{-10}m$$

D
$$5.300 \times 10^{-10}m$$

Solution
Question 5
1 / -0

If the radius of first orbit of $$H$$ atom is $${a_ \circ }$$ the de-Broglie wavelength of an electron in the third orb is :

A
$$6\pi {a_ \circ }$$

B
$$8\pi {a_ \circ }$$

C
$$2\pi {a_ \circ }$$

D
$$4\pi {a_ \circ }$$

Solution
Question 6
1 / -0

If $$E_{e},E_{a},$$ and $$E_{p}$$ represents the kinetic energy of an electron,$$\alpha$$-particle and proton respectively each moving with same de-broglie wavelength then:

A
$$E_{e} = E_{a} = E_{p}$$

B
$$E_{e} > E_{a} > E_{p}$$

C
$$E_{a} > E_{p} =>E_{a}$$

D
$$E_{e} > E_{p} =>E_{a}$$

Solution
Question 7
1 / -0

A bulb of 40 W is producing a light of wavelength 620 mm with $$60\%$$ of efficiency then the number of photons emitted by the bulb in 20 seconds are (1 eV=$$16\times10^{-19}$$,J, hc=12400 eV A)

A
$$2\times10^{18}$$

B
$$10^{18}$$

C
$$10^{21}$$

D
$$1.5\times10^{21}$$

Solution
Question 8
1 / -0

What is wavelength associated with $$150$$ $$eV$$ electron?

A
$$1\overset { \circ }{ A } $$

B
$$0.1 \overset { \circ }{ A } $$

C
$$0.01 \overset { \circ }{ A } $$

D
$$0.001 \overset { \circ }{ A } $$

Solution
Question 9
1 / -0

An electron falls from rest through a potential difference of $$100\ V$$. What is its de Brogile wavelength ?

A
$$0.123\ nm$$

B
$$6.63\ nm$$

C
$$12.03\ nm$$

D
$$5.57\ nm$$

Solution
Question 10
1 / -0

Calculate the wavelength of spectral line of the strongest wavelength in Balmer seres of hydrogen

A
1526 nm

B
124 nm

C
956 nm

D
656 nm

Solution