Question

Sort the statements based on whether they are correct or incorrect. All waves have the same wavelength. Radio telescopes give us information about the birthplace of a star. If the wavelength of a wave increases, its frequency also increases. Visible light is a kind of electromagnetic wave. All objects emit electromagnetic waves.

Answer 1

Correct statements include radio telescopes providing information about star birthplaces, visible light being a type of electromagnetic wave, and all objects emitting electromagnetic waves. Incorrect statements are that all waves have the same wavelength and that an increase in wavelength implies an increase in frequency.

Step-by-step explanation:

Let's sort the statements based on their correctness:

• Correct: Radio telescopes give us information about the birthplace of a star. This is true because radio telescopes detect radio waves emitted by stars and astronomical objects, providing data about their origins and life cycles.
• Correct: Visible light is a kind of electromagnetic wave. Indeed, visible light is a small part of the broader electromagnetic spectrum that our eyes can see.
• Correct: All objects emit electromagnetic waves. This statement is accurate; all objects, depending on their temperature, emit electromagnetic radiation.
• Incorrect: All waves have the same wavelength. This is false because waves, including electromagnetic waves, come in a vast range of wavelengths from kilometers to pilometers.
• Incorrect: If the wavelength of a wave increases, its frequency also increases. This is incorrect because, according to the wave equation where velocity equals frequency times wavelength, an increase in wavelength results in a decrease in frequency if the wave's speed is constant, which is the case for electromagnetic waves in a vacuum.

Answer 2

All waves have the same wavelength.

FALSE

All waves may not be of same frequency because all waves are of different energy levels and energy depends on the frequency which is different.

Radio telescopes give us information about the birthplace of a star.

FALSE

Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.

If the wavelength of a wave increases, its frequency also increases.

FALSE

relation between frequency and wavelength is given as

`\\u = (c)/(\lambda)`

so they are inversely related to each other and hence if wavelength is increased then frequency must have to decrease.

Visible light is a kind of electromagnetic wave.

TRUE

All visible light is a part of electromagnetic waves.

All objects emit electromagnetic waves.

TRUE

Due to thermal vibrations all objects radiate electromagnetic waves of different frequencies.