Planck's Quantum Hypothesis
Trending Questions
Q. Two bulbs A and B emit red light and yellow light at 8000 A∘ and 4000 A∘ respectively. The number of photons emitted by both the bulbs per second is the same. If the red bulb is labelled as 100 watts, find the wattage of the yellow bulb.
Q.
The dissociation energy of H2 is 430.53 kJ mol−1. If hydrogen is dissociated by illumination with radiation of wavelength 253.7 nm, the fraction of the radiant energy which will be converted into kinetic energy is given by
1.22%
8.76%
2.22%
100%
Q. A dye absorbs a photon of wavelength λ and re-emits the same energy into two photons of wavelength λ1 and λ2 respectively. The wavelength λ is related with λ1 and λ2 as:
- λ=(λ1+λ2)(λ1λ2)
- λ=(λ1λ2)(λ1+λ2)
- λ=(λ21+λ22)(λ1λ2)
- λ=(λ21λ22)(λ1+λ2)
Q. Calculate the wavelength of the radiation which would cause the photo-dissociation of chlorine molecule if the Cl-Cl bond energy is 243 kJ/mol.
- 493 nm
- 4900 μm
- 4900 nm
- 493 m
Q. Calculate the energy in kilocalorie per mole of photons of an electromagnetic radiation having a wavelength of 7600 ∘A.
- 33.56
- 37.56
- 47.35
- 42.35
Q. What is a packet of energy called?
- Electron
- Photon
- Positron
- Proton
Q. If a dye absorbs a photon of wavelength λ and re-emits the absorbed energy as two photons of wavelength λ1 and λ2. Then:
- λ=λ1+λ2λ1λ2
- λ=λ1λ2λ1+λ2
- λ=λ21λ22λ1+λ2
- λ=λ1λ2(λ1+λ2)2
Q. A 100 W power source emits green light having a wavelength of 5000 ∘A. How many photons are emitted per minute by the source?
- 1.5×1020
- 3.5×1022
- 1.5×1022
- 3.5×1020
Q. A certain laser transition emits 6.37×1015 quanta sec−1m−2. Calculate the power output in J sec−1 m−2.
Given: λ=632.8 nm
Given: λ=632.8 nm
- 2.5×10−3 J sec−1 m−2
- 2.0×10−3 J sec−1 m−2
- 1.6×10−3 J sec−1 m−2
- 2.3×10−3 J sec−1 m−2
Q. What is the ratio of the energies of two radiations in which one has a wavelength of 6000 ∘A the other has a wavelength of 2000 ∘A?
- 1:3
- 1:2
- 2:1
- 2:3