Which Energy State Of The Triply Ionized Beryllium (Be+++) Has The Same Electrons Orbital Radius As That Of The Ground State Of Hydrogen? Given Zfor Beryllium = 4.

A nucleus  emits one alpha particle and two β-particle The resulting nucleus is

A sample of a radioactive element has a mass of 10g at an instant t = 0. The oppropriate mass of this element in the element in the sample after two mean lives is

If the half lives of a radioactive element that decays in 6 days is 7/8. The fraction that decays in 10 days will be

The wavelength  of de Broglie waves associated with an electron (massm, charger e) accelerated through a potential difference of V is given by (his Planck’s constant)  

A proton, when accelerated through a potential difference of V volts, has a wavelength  associated with it. If an alpha particle ius to have the same wavelength , it must be accelerated through a potential difference of

A proton and an electron move with the same velocity. The associated wavelength for proton is

Two particles of masses m and 2m have equal kinetic energies. Their de Broglie wavelength are in the ratio of 

The wavelength of de Broglie wave associated with a thermal neutron of mass m at absolute temperature T is given by (here k is the Boltzmann constant) 

The momentum of a photon of frequency v is

Which energy state of doubly ionized lithium (Li⁺⁺) has the same energy as that of the ground state of hydrogen? Given Z for lithium = 3.