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Age problems (for practice) | class 10 mathematics | advguruji | Physics Advocate

Linear Equations Q1. Ten years ago, father was twelve times as old as his son and ten years hence, he will be twice as old as his son will be. Find their present ages. Ans. Present age of father = 34 years          Present age of son = 12 years Q2. Three years ago, Priya's mother was six times older than her. Four years from now, Priya's mother will be one year older than thrice her age. Find the present age of Priya and her mother. Ans.  Present age of Priya = 8 years       Present age of mother = 33 years Q3. Five years ago, Rakesh was five times younger than his mother. Ten years from now, his age will be half of his mother's age. Find the present age of Rakesh and his mother. Ans. Present age of Rakesh = 10 years      Present age of mother = 30 years Q4.           (equation in one variable) A  is elder to  B  by two years. A's father  F  is twice as old as  A .  ...
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Energy of electron in nth orbit of Hydrogen atom | Numericals by Physics Advocate

Q1. How much energy is needed to relocate an electron from first excited state to fourth excited state in an Hydrogen atom? Also, find the type of light needed in this process. Q2. Find the wavelength of light released when an electron jumped from 4th excited state to ground state in an Hydrogen atom. Also, name the series. Q3. Find the wavenumber of light released when an electron jumped from 5th excited state in bracket series (in H - atom). www.advguruji.blogspot.com Q4. An electron absorbed 2.55 eV energy and jumped from first excited state to nth excited state. Find n . Q5. when an electron jumped from second excited state to some different state, UV ray was released. Name the state and find the frequency of the UV ray. --------------------------------------------------------------------------------------------------- ANSWERS Ans1. 2.86 eV Ans2. 99 nm Ans3. 0.375 × 10⁶ m-¹ Ans4. n = 3 Ans5. 2.90 × 10¹⁵ Hz by    www.advguruji.blogspot.com
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Multiple choice Questions on satellites,. class 11,. advguruji | Physics Advocate

QUESTIONS ON SATELLITES Q1. The orbital velocity of an artificial satellite in a circular orbit just above the Earth's surface is 'v'. For a satellite orbiting at an altitude of half the earth's radius the orbital velocity is ____. Q2. Two satellites P and Q ratio of masses 2:1 are in circular orbits of radii 'r' and '2r' respectively. Then ratio of total mechanical energy of satellite P to Q is ____. A. 1:4 B. 1:2 C. 4:1 D. 1:1 Q3. The period of a satellite in a circular orbit around a planet is independent of ____. A. The mass of the satellite B. The radius of the planet C. The mass of the planet D. All of these Q4. Two identical satellites are orbiting at distances 'R' and '7R' respectively from the surface of Earth, R is the radius of Earth. The ratio of their _ A. Kinetic energies is 4 B. Potential energies is 4 C. Total energies is 4 D. All of these Q5. The orbital velocity of a body close to Earth's surface is ____....
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