MEDIUM
Earn 100

Which graph shows how the energy E of a photon of light is related to its wavelength λ ?

50% studentsanswered this correctly

Important Questions on Structure of Atom

EASY
The value of Planck's constant in electron volts (eV) is _______
EASY
If the work function for the photoelectron emission of a metal is 3.75eV, then the threshold wave length of the radiation needed for the ejection of the electron is approximately
MEDIUM
If the energies of two light radiations E1 and E2 are 25eV and 100eV respectively, then their respective wavelengths λ1 and λ2 would be in the ratio λ1:λ2=
EASY
The energies E1 and E2 of two radiations are 25 eV and 50 eV, respectively. The relation between their wavelengths i.e., λ1 and λ2 will be
MEDIUM
Which of the activities can be compared to the concept of quantisation?
MEDIUM
The energy of one mole of photons of radiation of wavelength 300 nm is (Given : h=6.63×10-34 J s,NA=6.02×1023 mol-1c=3×108 m s-1)
MEDIUM
Upon irradiation with radiation of a suitable wavelength on the cathode, the photocurrent produced was reduced to zero by applying a stopping potential of 2.63 V. If the work function of the cathode is 4.3 eV, find the approximate wavelength of the radiation (in nm)
EASY
Given the value of Rydberg constant is 107 m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be:
MEDIUM
TiH2O63+ absorbs light of wavelength 498 nm during a d-d transition. The octahedral splitting energy for the above complex is _______ ×10-19 J. (Round off to the Nearest Integer). h=6.626×10-34 Js;   c=3×108 ms-1.
MEDIUM
Let the energy of an nth  orbit of H atom be -21.76×10-19/n2 J. What will be the longest wavelength of energy required to remove an electron from the third orbit of He+ ion?
MEDIUM
The energy of one mole of photons of radiation of frequency 2×1012 Hz in Jmol-1 is _____ J .
(Nearest integer)
(Given: h=6.626×10-34Js NA=6.022×1023 mol-1)
HARD
The figure that is not a direct manifestation of the quantum nature of atom is :
EASY

Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is _______.

Question Image

A. T4 > T3 > T2 > T1
 B. The black body consists of particles performing simple harmonic motion.
 C. The peak of the spectrum shifts to shorter wavelength as temperature increases.
 D. T1ν1 = T2ν2 = T3ν3
 E. The given spectrum could be explained using quantisation of energy

MEDIUM
The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is x×1013. The value of x is (Nearest integer) h=6.63×10-34Js, c=3.00×108 ms-1:
HARD

The number of incorrect statement/s about the black body from the following is______

(A) Emit or absorb energy in the form of electromagnetic radiation.

(B) Frequency distribution of the emitted radiation depends on temperature.

(C) At a given temperature, intensity vs frequency curve passes through a maximum value.

(D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

EASY
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is:
( h = Planck's constant, c = speed of light)
MEDIUM
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?
MEDIUM

A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x×1020. The value of x is _____ .

(Nearest integer)

 [Given : h=6.63×10-34Js and c=3.0×108 ms-1

EASY
The wavelengths of two photons are 2000  and 4000 , respectively. What is the ratio of their energies?
EASY
Calculate the energy in corresponding to light of wavelength 45 nm: (Planck’s constant h=6.63×10-34Js:speed of light c=3×108 ms-1)