Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of which of the following molecules?

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#Question id: 20029

#XL - P Chemistry

An electron of a velocity ‘’ is found to have a certain value of de-Broglie wavelength. The velocity to be possessed by the neutron to have the same de-Broglie wavelength is

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#Question id: 20030

#XL - P Chemistry

The momentum of a particle associated with de-Broglie’s wave length of 6 A⁰ is

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#Question id: 20031

#XL - P Chemistry

Frequency of matter wave is equal to v = frequency, v = velocity of particle

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#Question id: 20032

#XL - P Chemistry

If threshold wavelength for ejection of electron from metal is 300nm, then work function for photoelectric emission is

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#Question id: 20033

#XL - P Chemistry

The mass of one mole of electron is

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#Question id: 20034

#XL - P Chemistry

In two H atoms A and 13 the electrons move around the nucleus in circular orbits of radius r and 4r respectively. The ratio of the times taken by them to complete one revolution is