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qUESTIONS

For the Bohr’s second orbit of circumference 2πr, the de- Broglie wavelength of revolving electron will be

One drop of soap bubble of diameter D breaks into 27 drops having surface tension. The change in surface energy is

If the kinetic energy of a free electron doubles, its de- Broglie wavelength changes by the factor

A mercury drop of radius 1.0 cm is sprayed in to 106 droplets of equal size. The energy expended in this process is (surface tension of mercury is equal to 32× 10-² Nm-¹ )

Nuclear radii may be measured by scattering high energy electrons from nuclei. What is the de-Broglie wavelength for 200 MeV electrons?

A soap bubble A of radius 0.03 m and another bubble B of radius 0.04 m are brought together so that the combined bubble has a common interface of radius r, then the value of r is

Water rises in a capillary tube to a height h. Choose false statement regarding capillary rise from the following.

The excess of pressure inside the first soap bubble is three times that inside the second bubble. Then, the ratio of the volume of the first bubble to that of second bubble will be

According to De-Broglie hypothesis if there is an electron of mass ‘m’ and is accelerated by potential difference ‘V’, then its associated wavelength is ‘λ’. When a proton of mass ‘M’ is accelerated through potential difference ‘9V’ then the wavelength associated with it is: [MHT-CET 2021]

Photoelectric emission takes place from a certain metal at threshold frequency ‘v’. If the radiation of frequency ‘2v’ is incident on the metal plate, the maximum velocity of the emitted photoelectron will be: (m = mass of electron, h = Planck’s constant) [MHT-CET 2021]

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