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atomic mass unit (u), defined as 1/12 th of the mass of the carbon (12C) atom. According to this definition 12 mass of one C atom 1u = 12 26 1.992647 10 kg 12 × − = = ×1.660539 10 kg−27 (13.1) The atomic masses of various elements expressed in atomic mass unit (u) are close to being integral multiples of the mass of a hydrogen atom.
- 11.4 EXPERIMENTAL STUDY OF PHOTOELECTRIC EFFECT
- 11.4.2 Effect of potential on photoelectric current
- SUMMARY
- POINTS TO PONDER
- 11.1 The history of wave-particle flip-flop
Figure 11.1 depicts a schematic view of the arrangement used for the experimental study of the photoelectric effect. It consists of an evacuated glass/quartz tube having a photosensitive plate C and another metal plate A. Monochromatic light from the source S of sufficiently short wavelength passes through the window W and falls on the photosensit...
We first keep the plate A at some positive accelerating potential with respect to the plate C and illuminate the plate C with light of fixed frequency ν and fixed intensity I1. We next vary the positive potential of plate A gradually and measure the resulting photocurrent each time. It is found that the photoelectric current increases with increase...
The minimum energy needed by an electron to come out from a metal surface is called the work function of the metal. Energy (greater than the work function (φ ο) required for electron emission from the metal surface can be supplied by suitably heating or applying strong electric field or irradiating it by light of suitable frequency. Photoelectric ...
Free electrons in a metal are free in the sense that they move inside the metal in a constant potential (This is only an approximation). They are not free to move out of the metal. They need additional energy to get out of the metal. Free electrons in a metal do not all have the same energy. Like molecules in a gas jar, the electrons have a certain...
What is light? This question has haunted mankind for a long time. But systematic experiments were done by scientists since the dawn of the scientific and industrial era, about four centuries ago. Around the same time, theoretical models about what light is made of were developed. While building a model in any branch of science, it is essential to s...
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Nov 2, 2023 · NCERT Class 12 Chemistry Books in English PDF Download. NCERT Class 12 Chemistry Books are provided in PDF form so that students can access it at any time anywhere. Class 12 NCERT Chemistry Books are created by the best professors who are experts in Chemistry and have good knowledge in the subject.
Example 13.3 Find the energy equivalent of one atomic mass unit, first in Joules and then in MeV. Using this, express the mass defect of 8O in MeV/c2. 16. Solution. 1u = 1.6605 × 10–27 kg To convert it into energy units, we multiply it by c2 and find that energy equivalent = 1.6605 × 10–27 × (2.9979 × 108)2 kg m2/s2.
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