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CBSE Class 12-science Answered

What is black hole?
Asked by | 30 Mar, 2009, 12:49: PM
answered-by-expert Expert Answer

A black hole is a super dense object, a region of space resulting from the collapse of a star;  that has an intense gravitational pull.

Answered by | 31 Mar, 2009, 02:52: PM

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CBSE 12-science - Physics
what are ghost particles please answer how is that not able to interact with other subatomic particles ..?is that faster than photons?
Asked by mohapatraswetalina88 | 21 Apr, 2024, 12:18: PM
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CBSE 12-science - Physics
solve
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Asked by rohandhawaniya17112006 | 06 Mar, 2024, 03:32: PM
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CBSE 12-science - Physics
nuclei
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Asked by murshidibrahimkk | 08 Feb, 2024, 10:28: AM
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CBSE 12-science - Physics
. A nucleus of mass number 240 and having binding energy/nucleon 7.6 MeV splits into two fragments Y, Z of mass numbers 110 and 130 respectively. If the binding energy/nucleon of Y, Z is equal to 8.5 MeV each, calculate the energy released in the nuclear reaction.
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Asked by kailasks2007 | 28 Dec, 2023, 08:14: PM
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CBSE 12-science - Physics
Please answer this question. Draw a graph showing the variation of binding energy per nucleon as a function of mass number A. The binding energy per nucleon for heavy nuclei (A > 170) decreases with the increase in mass number. Explain.
Asked by varma.renu9481 | 06 Mar, 2023, 05:44: PM
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CBSE 12-science - Physics
55Cs124(Z=55,A=124) has a half life of 30.8s. (a) If we have 7.8 microgram initially, how many nuclei are presents? How many are present 2 min later? (b) What is the activity at this time? (c) After how much time will the activity drop to less than about 1 per second?
Asked by arjunsah797 | 16 May, 2022, 02:17: PM
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CBSE 12-science - Physics
the atomic masses of two different nuclei are 3 and 81 then the ratio of their radius r
Asked by akashjyani705 | 06 Mar, 2022, 04:39: PM
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CBSE 12-science - Physics
WHAT ARE ISOTONES AND ISOTOPES CORRECT DEFINITION?
Asked by sharonashoksp | 27 Jun, 2021, 02:44: PM
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CBSE 12-science - Physics
Nuclear density of hydrogen is 2.3x1017 kg/m3. Given A = 56 for iron, find its nuclear density
Asked by gaurish6247 | 07 Apr, 2021, 05:16: PM
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CBSE 12-science - Physics
how are we supposed to solve this question
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Asked by merinlijo_20002 | 17 Jun, 2020, 10:05: AM
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