A parallel beam of light of wavelength $900 \,nm$ and intensity $100 \,Wm ^{-2}$ is incident on a surface perpendicular to the beam Tire number of photons crossing $1 \,cm ^2$ area perpendicular to the beam in one second is :
- \(3 \times 10^{16}\)
- \(4.5 \times 10^{16}\)
- \(4.5 \times 10^{17}\)
- \(4.5 \times 10^{20}\)
The Correct Option is B
Solution and Explanation
Top Questions on Dual nature of radiation and matter
- Two spherical black bodies radiate the same amount of heat per second. If their temperatures are \( T_1 \) and \( T_2 \), and their radii are \( R_1 \) and \( R_2 \), respectively, find the relation between their temperatures and radii.
- MHT CET - 2025
- Physics
- Dual nature of radiation and matter
- Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit photoelectrons from the surface are members of:
- CBSE CLASS XII - 2025
- Physics
- Dual nature of radiation and matter
- Radiations of two frequencies are incident on a metal surface of work function 2.0 eV one by one. The energies of their photons are 2.5 eV and 4.5 eV respectively. Find the ratio of the maximum speed of the electrons emitted in the two cases.
- CBSE CLASS XII - 2025
- Physics
- Dual nature of radiation and matter
- Whether the total mass of nuclei increases, decreases or remains unchanged?
- CBSE CLASS XII - 2025
- Physics
- Dual nature of radiation and matter
- Does the process require energy or produce energy?
- CBSE CLASS XII - 2025
- Physics
- Dual nature of radiation and matter
Questions Asked in JEE Main exam
- Given below are two statements:
Statement I: Ozonolysis followed by treatment with Zn, H$_2$O of cis-2-butene gives ethanal.
Statement II: The product obtained by ozonolysis followed by treatment with Zn, H$_2$O of 3, 6-dimethyloct-4-ene has no chiral carbon atom.
In the light of the above statements, choose the correct answer from the options given below.- JEE Main - 2025
- Organic Chemistry- Some Basic Principles and Techniques
Which of the following amine(s) show(s) positive carbamylamine test?
- Total enthalpy change for freezing of 1 mol water at 10°C to ice at -10°C is ______ (Given: $ \Delta_{\text{fus}}H = x \, \text{kJ/mol} $, $ C_p[\text{H}_2\text{O}(l)] = y \, \text{J mol}^{-1} \text{K}^{-1} $, and $ C_p[\text{H}_2\text{O}(s)] = z \, \text{J mol}^{-1} \text{K}^{-1} $)
- JEE Main - 2025
- Thermochemistry
- An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution would be: $ \text{(Given log 2 = 0.30)} $
- JEE Main - 2025
- Solutions
Given below are two statements:
Statement I: Dimethyl ether is completely soluble in water. However, diethyl ether is soluble in water to a very small extent.
Statement II: Sodium metal can be used to dry diethyl ether and not ethyl alcohol.
In the light of the given statements, choose the correct answer from the options given below:- JEE Main - 2025
- Alcohols, Phenols and Ethers
Concepts Used:
Dual Nature of Radiation and Matter
The dual nature of matter and the dual nature of radiation were throughgoing concepts of physics. At the beginning of the 20th century, scientists untangled one of the best-kept secrets of nature – the wave-particle duplexity or the dual nature of matter and radiation.
Electronic Emission
The least energy that is needed to emit an electron from the surface of a metal can be supplied to the loose electrons.
Photoelectric Effect
The photoelectric effect is a phenomenon that involves electrons getting away from the surface of materials.
Heisenberg’s Uncertainty Principle
Heisenberg’s Uncertainty Principle states that both the momentum and position of a particle cannot be determined simultaneously.