Question : An electron microscope gives higher magnifications than an optical microscope because:
Option 1: The velocity of electrons is smaller than that of light.
Option 2: The wavelength of electrons is smaller as compared to the wavelength of visible light.
Option 3: The electrons have more energy than the light particulars.
Option 4: The electron microscope uses more powerful lenses.
Correct Answer: The wavelength of electrons is smaller as compared to the wavelength of visible light.
Solution : The correct option is The wavelength of electrons is smaller as compared to the wavelength of visible light.
Electron microscopes have greater magnifications than optical microscopes because electron wavelengths are much shorter than visible light. The wave-particle duality of electrons and photons (light particles) accounts for this basic variation in wavelength. Electron microscopes utilise electrons with wavelengths in the picometre (pm) range, which is several orders of magnitude smaller than visible light.
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Question : Which among the following will be a negative ion?
Option 1: If it has more electron than protons
Option 2: If it has more electrons than neutrons
Option 3: If it has more protons than electrons
Option 4: If it has more protons than neutrons
Question : What does it mean when an object has a positive charge?
Option 1: It has more electrons than protons.
Option 2: It has more protons than electrons.
Option 3: It has more neutrons than electrons.
Option 4: It has more neutrons than protons.
Question : Electrons in the highest energy level of an atom are called ________.
Option 1: Valence protons
Option 2: Orbital protons
Option 3: Valence electrons
Option 4: Orbital electrons
Question : Direct conversion of solar energy with the use of a photo voltaic cell results in the production of
Option 1: Optical energy
Option 2: Electrical energy
Option 3: Thermal energy
Option 4: Mechanial energy
Question : Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
Option 1: Microwave, infrared, visible, X-rays
Option 2: X-rays, visible, infrared, Microwave
Option 3: Visible, infrared, microwave, X-ray
Option 4: X-rays, infrared, visible, microwave
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