Electromagnetic Waves and Spectrum

Using the formula frequency = speed of light / wavelength (f = c / λ), where c is approximately 300,000,000 m/s and λ is 1 m, the frequency is 300,000,000 Hz.

To solve this question, the user needs to know the definition of the speed of light.

The speed of light is defined as the distance light travels in a vacuum per unit of time.

Now, let's go through each option and explain why it is right or wrong:

A. 300,000 Mt/Sec: This option is incorrect because "Mt" is not a standard unit of measurement for speed. Also, the correct value of the speed of light is 299,792.458 km/s, which is not equal to 300,000 Mt/Sec.

B. 30000 Km/Sec: This option is incorrect because the actual value of the speed of light is much greater than 30,000 km/s. The correct value is around 299,792.458 km/s.

C. 300,000 Km/Sec: This option is correct. The speed of light in a vacuum is approximately 299,792.458 km/s, which is rounded up to 300,000 km/s for convenience.

D. None of the above: This option is incorrect because Option C is the correct answer.

Therefore, the Answer is: C. 300,000 Km/Sec

Electromagnetic radiation includes Radio waves, Visible Light, and Gamma rays across the spectrum. Alpha and Beta are particle radiation (not EM waves), and Supersonic refers to sound speed.

The speed of light in vacuum is approximately 3×10^8 m/s, which equals 3×10^10 cm/s. Option B correctly converts this value to centimeters per second, while the other options use incorrect units or magnitudes.

Infrared waves have longer wavelengths than visible red light. The visible spectrum ranges from approximately 380nm (violet) to 750nm (red). Infrared radiation starts just beyond red light (~700nm-1mm) and has longer wavelengths. Yellow and green have shorter wavelengths than red (~570-590nm for yellow, ~495-570nm for green), while ultraviolet has shorter wavelengths than the entire visible spectrum (~10-400nm).

Spontaneous emission produces the initial photons when excited atoms decay randomly without external stimulation. These seed photons then stimulate further emission through stimulated emission, amplifying the light, the fundamental principle of laser operation.

Blue light in the visible spectrum has a wavelength range of approximately 450-495 nanometers. The interval 490-450 nm represents this range, with shorter wavelengths corresponding to higher energy.

Blue light in the visible spectrum has a wavelength range of approximately 450-495 nanometers. The interval 490-450 nm represents this range, with shorter wavelengths corresponding to higher energy.

Blue light in the visible spectrum has a wavelength range of approximately 450-495 nanometers. The option '490-450 nm' represents this range, though it's written in descending order. This wavelength range places blue light between green (longer wavelengths) and violet (shorter wavelengths) in the electromagnetic spectrum. Blue light has higher frequency and energy compared to green and yellow light.

A light year is a unit of distance equal to the distance light travels in one year (about 5.88 trillion miles or 9.46 trillion kilometers). It is not a measure of energy, speed, or intensity.

A light year is a unit of distance, not time. It measures the distance light travels in one year, approximately 9.46 trillion kilometers or 5.88 trillion miles. Astronomers use this unit to measure vast interstellar and intergalactic distances.

A light year is a unit of distance, not time. It measures how far light travels in vacuum in one year (about 9.46 trillion kilometers or 5.88 trillion miles). Astronomers use it to measure vast distances between stars and galaxies.

Fraunhofer lines are dark absorption lines in the solar spectrum, caused by elements in the Sun's outer atmosphere absorbing specific wavelengths. They were first systematically studied by Joseph von Fraunhofer in 1814. The other named scientists contributed to other areas of physics.

The speed of light in vacuum is approximately 3 × 10^8 meters per second, a fundamental constant in physics. This value is denoted by 'c' and is the maximum speed at which all massless particles and waves can travel. The other options (10^9, 10^10, 10^11) are orders of magnitude too large. This constant is crucial in relativity and many areas of modern physics.

Cosmic Microwave Background (CMB) radiation is the thermal radiation left over from the Big Bang. It was emitted approximately 380,000 years after the universe began when it had cooled enough for atoms to form. Originally visible light, it has been red-shifted by the expansion of the universe over 13.8 billion years into microwave wavelengths (a few centimeters). This 'afterglow' provides crucial evidence for the Big Bang theory.