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Test: Developments leading to Bohr's Model of Atom - NEET MCQ


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15 Questions MCQ Test NCERTs at Fingertips: Textbooks, Tests & Solutions - Test: Developments leading to Bohr's Model of Atom

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Test: Developments leading to Bohr's Model of Atom - Question 1

What will be the wavenumber of yellow radiation having wavelength 240 nm?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 1

Wavelength of yellow light = 240 nm
240 x 10-9 m

Test: Developments leading to Bohr's Model of Atom - Question 2

What will be the energy of one photon of radiation whose frequency is 5 × 1014 Hz?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 2

The energy of one photon is given by the expression, E = hν
where, h = 6.626 × 10−34 Js and ν= 5 × 1014 s−1
E = 6.626 × 10−34 × 5 × 1014 = 3.313 × 10−19J

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Test: Developments leading to Bohr's Model of Atom - Question 3

The energy of a photon is given as 3.03 x 10-19 J/atom. The wavelength of the photon is

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 3


Test: Developments leading to Bohr's Model of Atom - Question 4

What will be the energy of a photon which corresponds to the wavelength of 0.50 Å?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 4

E = hv = hc/λ

Test: Developments leading to Bohr's Model of Atom - Question 5

Compare the energies of two radiations E1 with wavelength 800 nm and E2 with wavelength 400 nm.

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 5


Test: Developments leading to Bohr's Model of Atom - Question 6

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. What is the ionisation energy of sodium per atom?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 6

λ = 242 nm = 242 x 10-9 m
Energy required to ionise one atom of Na, E = hc/λ 

Test: Developments leading to Bohr's Model of Atom - Question 7

The energy difference between the ground state of an atom and its excited state is 3 x 10-19 J. What is the wavelength of the photon required for this transition?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 7

ΔE = hc/λ

Test: Developments leading to Bohr's Model of Atom - Question 8

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 8

Power of the bulb = 100 watt = 100 J s-1 Energy of one photon E = hv = hc/λ

Number of photons emitted 

Test: Developments leading to Bohr's Model of Atom - Question 9

Mark the incorrect statement regarding the photoelectric effect.

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 9

The number of electrons ejected is directly proportional to the intensity of light

Test: Developments leading to Bohr's Model of Atom - Question 10

A certain metal when irradiated by light (v = 3.2 x 1016 Hz) emits photoelectrons with twice K.E. as did photoelectrons when the same metal is irradiated by light (v = 2.0 x 1016 Hz). The v0 of the metal is

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 10

(K.E.)1 = hv1 - hv0
(K.E)2 = hv2 - hv0 
As (K.E)1 = 2 x (K.E.)2
∴ (hv1 - hv0)0) = 2(hv2 - hv0)
or v0 = 2v2 - v1
= 2 x (2 x 1016) - (3.2 x 1016
= 0.8 x 1016 Hz or 8 x 1015 Hz

Test: Developments leading to Bohr's Model of Atom - Question 11

The spectrum of white light ranging from red to violet is called a continuous spectrum because

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 11

In a continuous spectrum, the colours merge into each other in a continuous pattern.

Test: Developments leading to Bohr's Model of Atom - Question 12

The emission spectrum of hydrogen is found to satisfy the expression for the energy change ΔE (in joules) such that  where n1 = 1, 2, 3,.... and n2 = 2, 3, 4. The spectral lines corresponds to Paschen series if

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 12

For Paschen series, n1 = 3 and n2 = 4,5, 6...

Test: Developments leading to Bohr's Model of Atom - Question 13

The wavelength of visible light is

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 13

Visible light wavelength is from 380 nm to 760 nm.

Test: Developments leading to Bohr's Model of Atom - Question 14

Which of the following types of spectrum is best depicted by the given figure?

Detailed Solution for Test: Developments leading to Bohr's Model of Atom - Question 14

Since the sample is an 'Excited sample', therefore this can not be absorption spectra but is an emission spectrum. Also, the light disperses from the sample towards the detector direction.

Test: Developments leading to Bohr's Model of Atom - Question 15

Match the constants given in column I with their values given in column II and mark the appropriate, choice.

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