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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?

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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 × 10^{14} Hz?

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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

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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?

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

Compare the energies of two radiations E_{1} with wavelength 800 nm and E_{2} with wavelength 400 nm.

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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?

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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?

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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.

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

Mark the incorrect statement regarding the photoelectric effect.

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

A certain metal when irradiated by light (v = 3.2 x 10^{16} Hz) emits photoelectrons with twice K.E. as did photoelectrons when the same metal is irradiated by light (v = 2.0 x 10^{16} Hz). The v_{0} of the metal is

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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

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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 n_{1} = 1, 2, 3,.... and n_{2} = 2, 3, 4. The spectral lines corresponds to Paschen series if

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

The wavelength of visible light is

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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?

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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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