MEDIUM
11th ICSE
IMPORTANT
Earn 100

In the ultraviolet region of atomic spectrum of hydrogen, a line is obtained at 1050 Å. Calculate the energy of one million photons of this wavelength.

Important Questions on Structure of Atom

HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 19
The wavelength of first spectral line in the Balmer series is 6561 Å. Calculate the wavelength of the second spectral line in Balmer series.
HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 20
When a certain metal was irradiated with a light of frequency 3.2×1016 Hz, the photoelectrons had twice the kinetic energy as emitted when the same metal was irradiated with light of frequency 2.0×1016 Hz. Calculate the threshold frequency (v0) of the metal.
HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 21
What is the energy in joules required to excite the electron of the hydrogen from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state? The ground state electron energy is -2.18×10-11 ergs.
HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 22
The effect of uncertainty principle is significant only for motion of microscopic particles and is negligible for the macroscopic particle. Justify the statement with the help of a suitable example.
MEDIUM
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 22
Calculate the velocity condition for the wavelength associated with a moving electron to be equal to the wavelength associated with a moving proton. (Mass of electron=9.11×10-28 g; Mass of proton=1.67×10-24 g; h=6.6×10-34 Js; J≡kgm2s-2)
HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 23
Why is +2 oxidation state of Mn (25) quite stable, while the same is not true for iron (26)?
HARD
11th ICSE
IMPORTANT
ALL IN ONE ISC Chemistry CLASS 11>Chapter 2 - Structure of Atom>Chapter Practice>Q 23
What is meant by dual nature of electrons? Calculate the energy and wavelength of the photon emitted by hydrogen atom when electron makes a transition from n=2 to n=1. Given that the ionisation potential is 13.6 eV (1eV=1.6×10-19 J).