ahmedabudief

Dr. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

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

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Difficulties with the Classical mechanics theory

2020-02-03 00:08:56 | 78 | Physical Chemistry 3
Difficulties with the Classical mechanics theory
DICUSS DIFFICULTIES WITH THE CLASSICAL MECHANICS THEORY? Read more

Nuclear and chemical reactions

2020-02-02 14:40:11 | 64 | Selected topics in physical chemistry
Nuclear and chemical reactions
Defferentiate between Chemical and Nuclear Reactions? Read more

Binding energy

2020-02-02 14:22:31 | 29 | Selected topics in physical chemistry
Binding energy
What is the binding energy of 60Ni? The mass of a 60Ni atom is 59.9308 amu. The mass of an electron is 9.10939 x 10-31 kg and 1 amu is 1.66054 x 10-27 kg. (Z = 28) Read more

wavelength

2019-12-09 09:26:06 | 109 | 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

uncertainty

2019-12-09 07:08:22 | 41 | 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

work function

2019-12-09 07:06:51 | 90 | Physical Chemistry 3
work function
GIVEN THAT THE WORK FUNCTION FOR SODIUM METAL IS 1.82 EV, WHAT IS THE THRESHOLD FREQUENCY? Read more

de Broglie wavelength

2019-12-09 07:05:43 | 47 | 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

number of photons

2019-12-09 07:04:40 | 71 | 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

The bond  length

2019-12-01 10:35:31 | 20 | 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

The rotational  constant

2019-12-01 09:44:22 | 24 | 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