For a body moving with relativistic speed,if the velocity is doubled,then

  • A
    Its linear momentum is doubled
  • B
    Its linear momentum will be less than double
  • C
    Its linear momentum will be more than double
  • D
    Its linear momentum remains unchanged

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The radiation corresponding to the $3 \rightarrow 2$ transition of a hydrogen atom falls on a gold surface to generate photoelectrons. These electrons are passed through a magnetic field of $5 \times 10^{-4} \, T$. Assume that the radius of the largest circular path followed by these electrons is $7 \, mm$. The work function of the metal is $..... \, eV$. (Mass of electron $= 9.1 \times 10^{-31} \, kg$)

Match the following table.
$List-I$$List-II$
$A$. Michelson-Morley experiment$I$. The existence of anti-matter
$B$. Stern-Gerlach experiment$II$. The existence of de-Broglie matter waves
$C$. Davisson-Germer experiment$III$. Electrons have spins
$D$. Anderson discovery of positron$IV$. The non-existence of ether

The radiation corresponding to $3 \rightarrow 2$ transition of a hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of $3 \times 10^{-4} \ T$. If the radius of the largest circular path followed by these electrons is $10.0 \ mm$,the work function of the metal is close to......$ eV$.

By a suitable example,show that the particle or wave nature of light depends on the type of experiment.

One day on a spacecraft corresponds to $2$ days on the earth. The speed of the spacecraft relative to the earth is

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