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Here, V = 30kV {tex} = 30 \times {10^3}V = 3 \times {10^4}V{/tex}
- hvmax = eV
{tex}{v_{\max }} = \frac{{eV}}{h} = \frac{{1.6 \times {{10}^{ - 19}} \times 3 \times {{10}^4}}}{{6.63 \times {{10}^{ - 34}}}}Hz{/tex}
{tex} = 7.24 \times {10^{18}}Hz{/tex} - {tex}{\lambda _{\max }} = \frac{c}{{{v_{\max }}}} = \frac{{3 \times {{10}^8}}}{{7.24 \times {{10}^{18}}}}m{/tex}
{tex} \Rightarrow {\lambda _{\max }} = 0.414 \times {10^{ - 10}} = m = 0.414\mathop A\limits^o {/tex}
= 0.414 nm
Posted by Yashika Sankhla 6 years, 5 months ago
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Gaurav Seth 6 years, 5 months ago
answer : 4.608 × 10^-8 N
charge on alpha particle , Q = +2e = 2 × 1.6 × 10^-19 C = 3.2 × 10^-19 C
charge on electron, q = -e = -1.6 × 10^-19C
seperation between electron and alpha particle , r = 1A° = 10^-10 m
from Coulomb's law,
magnitude of force between electron and alpha particle , F = K|q||Q|/r²
= 9 × 10^9 × (1.6 × 10^-19)(3.2 × 10^-19)/(10^-10)²
= (9 × 10^9 × 5.12 × 10^-38)/(10^-20)
= (9 × 5.12) × 10^(9-38+20)
= 46.08 × 10^-9 N
= 4.608 × 10^-8 N
hence, magnitude of force between electron and alpha particle is 4.608 × 10^-8 N. and nature of force is attractive because charge are in opposite in nature.
Posted by Nishant Sharma 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
At the Earth’s poles the horizontal component of Earth’s magnetic field is zero. Hence the compass needles may align in any direction.
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Yogita Ingle 6 years, 5 months ago
The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. The hydrogen atoms of the molecule dissociate as soon as an electric discharge is passed through a gaseous hydrogen molecule. It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms. The hydrogen emission spectrum comprises radiation of discrete frequencies. These series of radiation are named after the scientists who discovered them.
Posted by Babita Shrestha 6 years, 5 months ago
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Gaurav Seth 6 years, 5 months ago
The lightning discharge is an example of electric discharge through gas at low pressure. The atmospheric pressure is low at high altitude and the electric discharge takes place there but it does not take place at low altitude where there is high pressure. Hence lightning discharge takes place at high altitude but not at low altitude.
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