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Radioactivity was discovered by: 
  • a)
    Rutherford 
  • b)
    Becquerel 
  • c)
    Bohr 
  • d)
    Benjamin Franklin 
Correct answer is option 'B'. Can you explain this answer?
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Radioactivity was discovered by:a)Rutherfordb)Becquerelc)Bohrd)Benjami...
​Radioactivity was discovered in 1896 by the French Scientist Henri Becquerel when he was working with phosphorescent materials. 
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Read the passages carefully and choose the best answer to each question out of the four alternatives.The quest to find life outside the solar system got a big boost with the discovery of seven Earth-size extra-solar planets, or exoplanets, orbiting a dwarf star about 40 light years away. Unlike earlier discoveries of exoplanets, all seven planets could possibly have liquid water — a key to life as we know it on Earth — with three planets having the greatest chance. This is by far the largest collection of Earth-like planets in the habitable Goldilocks zone of a star — neither too close nor too far from a star, which raises the possibility of liquid water being present on the surface. Only Earth has liquid water in the solar system. Since the dwarf star is much cooler than the Sun, the dimming of light each time a planet passes or transits before the star could be easily recorded from Earth unlike in cases when planets transit a Sun-like bright star. Since the initial discovery of three planets was made using the Chile-based Transiting Planets and Planetesimals Small Telescope, the exoplanet system is called TRAPPIST-1.Q. How many planets in our solar system have liquid water?

Read the passages carefully and choose the best answer to each question out of the four alternatives.The quest to find life outside the solar system got a big boost with the discovery of seven Earth-size extra-solar planets, or exoplanets, orbiting a dwarf star about 40 light years away. Unlike earlier discoveries of exoplanets, all seven planets could possibly have liquid water — a key to life as we know it on Earth — with three planets having the greatest chance. This is by far the largest collection of Earth-like planets in the habitable Goldilocks zone of a star — neither too close nor too far from a star, which raises the possibility of liquid water being present on the surface. Only Earth has liquid water in the solar system. Since the dwarf star is much cooler than the Sun, the dimming of light each time a planet passes or transits before the star could be easily recorded from Earth unlike in cases when planets transit a Sun-like bright star. Since the initial discovery of three planets was made using the Chile-based Transiting Planets and Planetesimals Small Telescope, the exoplanet system is called TRAPPIST-1.Q. The telescope TRAPPIST is in which country?

Radioactivity was discovered by:a)Rutherfordb)Becquerelc)Bohrd)Benjamin FranklinCorrect answer is option 'B'. Can you explain this answer?
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