Electromagnetic Waves
Physics ⇒ Electricity and Magnetism
Electromagnetic Waves starts at 11 and continues till grade 12.
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See sample questions for grade 11
A certain electromagnetic wave has a wavelength of 2 m. What is its frequency in vacuum? (c = 3 × 10^8 m/s)
A laser emits light with a wavelength of 500 nm. Calculate its frequency. (c = 3 × 10^8 m/s)
A microwave oven operates at a frequency of 2.45 GHz. What is the wavelength of the microwaves? (c = 3 × 10^8 m/s)
A radio station broadcasts at a frequency of 100 MHz. What is the wavelength of the radio waves in air? (c = 3 × 10^8 m/s)
Describe one practical application of ultraviolet radiation.
Describe the effect of increasing the frequency of an electromagnetic wave on its energy.
Explain the significance of the Poynting vector in electromagnetic waves.
Explain why electromagnetic waves are considered transverse waves.
Explain why electromagnetic waves can travel through outer space.
Explain why electromagnetic waves do not require a medium for propagation.
If the frequency of an electromagnetic wave is 5 × 10^14 Hz, what is its wavelength in vacuum? (Use c = 3 × 10^8 m/s)
Name the scientist who experimentally confirmed the existence of electromagnetic waves.
State the relationship between the electric field (E) and magnetic field (B) in an electromagnetic wave propagating in free space.
The electric field in an electromagnetic wave is given by E = E₀ sin(kx - ωt). What does ω represent?
What is the main difference between electromagnetic waves and sound waves?
What is the relationship between the energy (E) of a photon and the frequency (f) of the electromagnetic wave?
What is the speed of light in vacuum (in m/s)?
Who first predicted the existence of electromagnetic waves?
Write the mathematical relationship between the speed of light (c), frequency (f), and wavelength (λ) of an electromagnetic wave.
