ahmedabudief

Dr. Ahmed Mohammed Abu-Dief Mohammed

Assistant Professor - Assistant professor of Inorganic and Physical Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street

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2019-12-09 09:26:06 | 0 | Physical Chemistry 3
wavelength
Calculate the wavelength (in nm) of a photon emitted by a hydrogen atom when its electron drops from the _n_ = 5 state to the _n_ = 3 state. Read more

2019-12-09 07:08:22 | 0 | Physical Chemistry 3
uncertainty
Suppose the speed of a projectile of mass 1.0 g is known to within 1 μms-1. _Calculate the minimum uncertainty in its position. _ Estimate Δp from mΔv, where Δv is the uncertainty in the speed Read more

2019-12-09 07:06:51 | 2 | Physical Chemistry 3
work function
GIVEN THAT THE WORK FUNCTION FOR SODIUM METAL IS 1.82 EV, WHAT IS THE THRESHOLD FREQUENCY? Read more

2019-12-09 07:05:43 | 1 | Physical Chemistry 3
de Broglie wavelength
_Estimate the wavelength of electrons that have been accelerated from rest through a potential difference of 40 kV_ Read more

2019-12-09 07:04:40 | 1 | Physical Chemistry 3
number of photons
* Calculate the number of photons emitted by a 100 W yellow lamp in 1.0 s. * Take the wavelength of yellow light as 560 nm and assume 100 per cent efficiency. Read more

2019-12-01 10:35:31 | 0 | Physical Chemistry 3
The bond  length
From microwave spectroscopy, bond lengths can be determined with a correspondingly high precision, as illustrated in this example. From the rotational microwave spectrum of 1H35Cl, we find that _B __= _10.59342 cm-1. Given that the masses of 1H and 35Cl are 1.0078250 and 34.9688527 amu, respectively, determine the bond length of the 1H35Cl molecule. Read more

2019-12-01 09:44:22 | 0 | Physical Chemistry 3
The rotational  constant
The first rotational line in the rotational spectrum of CO is observed at 3.84235 cm-1. Calculate the rotational constant (B) and bond length of CO. The relative atomic weight C =12.00 and O = 15.9994, the absolute mass of H= 1.67343x10-27 kg. Read more

2019-11-22 10:40:01 | 0 | Physical Chemistry 3
Bohr’s Theory
ACCORDING TO BOHR’S THEORY, CALCULATE THE ENERGY OF THE THIRD LEVEL OF HYDROGEN ATOM. (RH = 2.179 X 10-18 J)ACCORDING TO BOHR’S THEORY, CALCULATE THE ENERGY OF THE THIRD LEVEL OF HYDROGEN ATOM. (RH = 2.179 X 10-18 J)ACCORDING TO BOHR’S THEORY, CALCULATE THE ENERGY OF THE THIRD LEVEL OF HYDROGEN ATOM. (RH = 2.179 X 10-18 J)ACCORDING TO BOHR’S ... Read more

2019-11-22 10:38:45 | 0 | Physical Chemistry 3
molecular spectra
* COMPARE BETWEEN ATOMIC AND MOLECULAR SPECTRA. (1 MARK) Read more

2019-11-22 10:38:12 | 0 | Physical Chemistry 3
Hamiltonian2
* THE HAMILTONIAN FOR THE ELECTRON AND A NUCLEUS OF MASS MN IS ………………………………………………………………………………………………………………………………………………………………………………………………THE HAMILTONIAN FOR THE ELECTRON AND A NUCLEUS OF MASS MN IS ………………………………………………………………………………………………………………………………………………………………………………………………THE HAMILTONIAN FOR THE ELECTRON AND A NUCLEUS OF MASS MN IS ……………………………………………………………………………………………………………………………………………………………………………………………… Read more