Untitled Quiz

Questions and Answers

The higher the frequency, the shorter the wavelength.

Diffraction is the bending and spreading of waves around an obstacle.

The gravitational force is the force between two masses, while the electrostatic force is the force between two charges.

They are all part of the electromagnetic spectrum. Signup and view all the answers

The atmosphere is transparent to visible light and radio frequency. Signup and view all the answers

A blackbody is an idealized object that absorbs all radiation falling on it. Signup and view all the answers

Wien's law reveals that if you can identify a star's color, you can identify its photosphere temperature. Signup and view all the answers

Stefan's law relates the amount of radiation emitted by a blackbody to its temperature. Signup and view all the answers

As it cools, its temperature decreases and it emits radiation at longer wavelengths. Signup and view all the answers

They measure the line of sight velocity by determining the shift in known spectral lines. Signup and view all the answers

It would lie in the visible light part of the electromagnetic spectrum. Signup and view all the answers

Study Notes

Wavelength is inversely related to frequency: higher frequency results in shorter wavelengths.
Wave velocity is a function of both wavelength and frequency.

Diffraction is the bending and spreading of waves when encountering obstacles.
This behavior demonstrates light’s wave nature, allowing certain light waves to be bent or blocked.

Gravitational force acts between two masses, while electrostatic force acts between two charges.
These forces depend on the distance separating the respective masses or charges.

Radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays are all part of the electromagnetic spectrum.
Visible light is the only type detectable by humans, while other waves differ in their atmospheric interaction.

The atmosphere is transparent to visible light, making it suitable for ground-based observations.
NASA uses radio frequencies for communication with space missions.

Wien's Law links the color of a star to its photosphere temperature, allowing temperature identification through color observation.

Stefan's Law connects the amount of radiation emitted by a blackbody to its temperature, proportional to the fourth power of temperature.

As a red-hot coal cools, it emits radiation at progressively longer wavelengths due to Wien’s Law.
According to Stefan's Law, the total emitted radiation decreases as temperature drops, causing the coal to appear fainter and redder over time.

Astronomers utilize the Doppler Effect to assess the velocity of celestial objects by observing shifts in spectral lines towards longer or shorter wavelengths.

The frequency of an electromagnetic wave equal to the size of a period is estimated to be in the visible light range, corresponding to light visible to the human eye.