Professor C.V. Raman’s demonstration was based on the radiation pressure exerted by e.m. waves. Tails of coments are due to pressure exerted due to solar radiation. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Category: Class 12 Physics
NCERT Solutions for Class 12 Physics updated for CBSE academic session 2021-2022.
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A microwave oven heats up a food item containing water molecules efficiently because frequency of waves produced in oven just matches with the frequency of vibrations of water molecules. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
As electromagnetic waves are plane polarised, therefore the receiving antenna of portable radio should be parallel to electric/magnetic part of the wave. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Yes, the magnitude of displacement current changes [actually decreases] if the frequency of the a.c. source is decreased. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Magnitudes of both conduction current as well as displacement current are zero when a capacitor is fully charged by a d.c. source. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Ultraviolet rays are used for water purifiers as well as in LASIC eye surgery. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Microwaves. Usedin microwave oven. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Infrared waves are produced by hot bodies and molecules on account of vibrations in atoms and molecules. their wavelength range from 1 mm to 700 nm. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Radio waves are produced by the acclerated motion of charges in conduction wires. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
(i) Microwaves, 10⁸ Hz to 10¹¹ Hz (ii) Ulraviolet rays, 7 × 10¹⁴ Hz to 5 × 10¹⁷ Hz. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.