Tag: physics

Questions Related to physics

Electron microscope is based on which scientific principle?

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  1. Light amplification by stimulated emission of radiation

  2. Wave nature of electrons

  3. Digital logic

  4. Reflection of ultrasonic waves

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Correct Option: B
Explanation:

Electron microscope is based on the principle of De-Broglie hypothesis of wave-nature of electrons.

Werner Heisenberg is known for his work on 

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  1. Inelastic scattering of light by molecules

  2. Quantum mechanics: Uncertainty principle

  3. Theory of super conductivity

  4. Expanding universe

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Correct Option: B
Explanation:

Answer is B

In quantum mechanics, the uncertainty principle, also known as Heisenberg's uncertainty principle, is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position and momentum, cannot be known simultaneously.

Bose-Einstein condensate is based on which scientific principle?

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  1. Magnetic confinement of plasma

  2. Trapping and cooling of atoms by laser beams and magnetic fields

  3. Wave nature of electrons

  4. Motion of charged particles in electromagnetic fields

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Correct Option: B
Explanation:

Bose-Einstein  condensate is made by trapping and cooling of atoms by laser beams and magnetic fields.

What was the major contribution/discoveries of  Archimedes?

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  1. Principle of buoyancy; Principle of the lever

  2. Wave theory of light

  3. Laws of electromagnetic induction

  4. Generation of electromagnetic waves

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Correct Option: A
Explanation:

Archimedes discovered the principal of buoyancy when he was taking a both observed watts getting displaced when he got into the both tub.He also discovered the principle of the lever.(a)

The Giant Metrewave Radio Telescope (GMRT) is related to _________________.

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  1. Superconductivity

  2. Generation, propagation and detection of electromagnetic waves

  3. Detection of cosmic radio waves

  4. Trapping and cooling of atoms by laser beams and magnetic fields

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Correct Option: C
Explanation:

The Giant Metrewave Radio Telescope (GMRT) is related to Detection of cosmic radio waves.

A free nucleus of mass $24$ u emits a gamma photon [when initially at rest]. The energy of the photon is $7$ MeV. The recoil energy of the nucleus in keV is 

physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

  1. $1.1$

  2. $1.2$

  3. $1.0$

  4. $1.3$

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Correct Option: A

Hydrogen atom will be in its ground state,if its electron is in

physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

  1. any energy level

  2. the lowest energy state

  3. the highest energy state

  4. the intermediate state

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Correct Option: B
Explanation:

Hydrogen atom has one electron. Depending upon the electron residing in which energy state hydrogen energy varies. So, for hydrogen atom to be in ground state electron should be in lowest energy state.

When writing electron configurations,electrons are represented in their lowest possible energy state.Which of the following state is this ?

physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

  1. excited state.

  2. lowest state.

  3. configuration state.

  4. ground state.

  5. unenergetic state.

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Correct Option: D
Explanation:

According to Aufbau's principle, electrons are filled in the atomic orbitals in order of lower energy to the higher energy starting from the orbital of lowest possible energy known as the ground state.

A beam of ultraviolet radiation having wavelength between $100nm$ and $200nm$ is incident on a sample of atomic hydrogen gas. Assuming that the atoms are in ground state, which wavelengths will have low intensity in the transmitted beam? 

physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

  1. $104nm$

  2. $103nm$

  3. $105nm$

  4. $100nm$

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Correct Option: B
Explanation:

Energy corresponding to wavelength 100nm, $\dfrac{1242eV}{100}=12.42 eV$

Energy corresponding to wavelength 200nm, $\dfrac{1242eV}{200}=6.21 eV$
Energy required from ground state to first excited stage:
$E _2-E _1=13.6-3.4=10.2 eV$
Energy required from ground state to second excited stage:
$E _3-E _1=13.6-13.6-1.5=12.1  eV$

Energy required from ground state to third excited stage:
$E _3-E _1=13.6-0.85=12.75  eV$

At 10.2 eV,
$Wavelength 1=\dfrac{1242}{10.2}=122nm$

At 12.1 eV,
$Wavelength 2=\dfrac{1242}{12.1}=103nm$



The ground state energy of the electron in hydrogen atom is equal to :

physics nuclei gamma decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

  1. the ground state energy of the electron in $ { He }^{ + } $

  2. the first excited state energy of the electron in $ { He }^{ + } $

  3. the first excited state energy of the electron in $ { Li }^{ +2 } $

  4. the ground state energy of the electron in $ { Be }^{ +3 } $

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Correct Option: B