Total charge in coulomb of 75.0 kg of electrons
  • a)
    -13.1868 × 10–19C
  • b)
    -8.242 × 1030C
  • c)
    -11.1896 × 1030C
  • d)
    -13.1868 × 1012C
Correct answer is option 'D'. Can you explain this answer?

Madan Jana answered  •  yesterday
Weight of electron is 9.11×10^(-31)kg.
Let electron number is N in 75kg
then N=75kg/(9.11×10^(-31)kg).
Then charge of 75kg electron is (N×1.6×10^(-19))
Where charge of one electron is 1.6×10^(-19)

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Light refracts when it goes from air to water, this is because which of the following get smaller?
  • a)
    wavelength, speed
  • b)
    wavelength, frequency 
  • c)
    speed, frequency
  • d)
    all three
Correct answer is option 'A'. Can you explain this answer?

Pie Academy answered  •  3 days ago
When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.

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