The condition under which a microwave oven heats up a food item containing
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is Options (a)…
6 years ago
Electromagnetic Waves
The electromagnetic waves detected using a thermopile and used in physical therapy
The electromagnetic waves detected using a thermopile and used in physical therapy are Options (a) gamma radiations (b) x-rays (c)…
6 years ago
In electromagnetic spectrum, the frequencies of γ-rays and x-rays and ultraviolet rays
In electromagnetic spectrum, the frequencies of γ-rays and x-rays and ultraviolet rays are denoted by n₁,n₂ and n₃ respectively, then…
6 years ago
A plane electromagnetic wave of frequency 20 MHz travels through a space along
A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at…
6 years ago
The speed of electromagnetic waves in vaccum is equal to
The speed of electromagnetic waves in vaccum is equal to Options (a) μ₀ε₀ (b) √(μ₀ε₀) (c) 1/√(μ₀ε₀) (d) 1/(μ₀ε₀) Correct…
6 years ago
The energy of the em waves is of the order of 15 keV. To which part of the spectrum
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does…
6 years ago
Light with an energy flux of 25×10⁴ Wm⁻² falls on a perfectly reflecting surface
Light with an energy flux of 25x10⁴ Wm⁻² falls on a perfectly reflecting surface at normal incidence. If the surface…
6 years ago
A leaf which contains only green pigments is illuminated by a laser light
A leaf which contains only green pigments is illuminated by a laser light of wavelength 0.6328 μm. It would appear…
6 years ago
In case of linearly polarised light, the magnitude of the electric field vector
In case of linearly polarised light, the magnitude of the electric field vector Options (a) does not change with time…
6 years ago
The electric vector vibration of an electromagnetic wave is given by
The electric vector vibration of an electromagnetic wave is given by E=(50 NC⁻1) sin ω(t-x/c). The intensity of the wave…
6 years ago