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 12
A laser emits light at a wavelength of 500 nm. Calculate its frequency. (Speed of light c = 3 × 108 m/s)
A plane electromagnetic wave has an electric field amplitude of 2 V/m. What is the amplitude of the magnetic field? (Speed of light c = 3 × 108 m/s)
A radio station transmits at a frequency of 100 MHz. What is the wavelength of the radio waves it emits? (Speed of light c = 3 × 108 m/s)
Describe the effect of increasing the frequency of an electromagnetic wave on its energy.
Describe the main difference between electromagnetic waves and mechanical waves.
Explain the significance of the displacement current in Maxwell's equations.
Explain why electromagnetic waves are considered transverse waves.
Explain why electromagnetic waves can be polarized.
Explain why electromagnetic waves travel slower in glass than in air.
If the frequency of an electromagnetic wave is 5 × 1014 Hz, what is its wavelength in vacuum? (Speed of light c = 3 × 108 m/s)
Name the scientist who first predicted the existence of electromagnetic waves.
State the relationship between the speed of light (c), the electric constant (ε0), and the magnetic constant (μ0).
State the speed of electromagnetic waves in vacuum.
The electric field of a plane electromagnetic wave is given by E = E0sin(kx - ωt). What is the corresponding expression for the magnetic field B?
What is the main reason why X-rays are dangerous to living tissue?
What is the ratio of the magnitudes of the electric field (E) to the magnetic field (B) in an electromagnetic wave in vacuum?
