Question

Question 1: Doppler Effect and Solar Radiation

As the Earth orbits the Sun, the Doppler effect causes a shift in the wavelength of sunlight. Considering only the change in the maximum radiation (green light), how does the color of sunlight emitted by the Sun change as we approach and move away from it due to Earth's orbital motion?

A) It shifts towards blue when approaching, and towards red when moving away.
B) It shifts towards red when approaching, and towards blue when moving away.
C) It remains constant, with no change in color.
D) It alternates between blue and red in a cyclic pattern.

Question 2: Earth's Orbital Speed and Doppler Effect

To calculate the Doppler shift in the wavelength of green light from the Sun, we need data on the speed at which the Earth moves in its orbit. How does Earth's orbital speed affect the Doppler effect on green light?

A) Higher orbital speed causes a greater shift towards blue.
B) Higher orbital speed causes a greater shift towards red.
C) Earth's orbital speed has no effect on the Doppler shift of green light.
D) Earth's orbital speed causes a cyclic change in the color of green light.

Question 3: Speed Needed for Traffic Light Color Change

Considering the Doppler effect and the change in color perception, let's explore how fast one needs to move towards a traffic light for it to start appearing red as green. What determines this color change?

A) Moving towards the traffic light at any speed will make it appear red as green.
B) The speed needed depends on the specific wavelength of green light.
C) The speed needed is independent of the color perception and the Doppler effect.
D) A slower speed is required for the color change compared to a faster speed.

Answer 1

The color of sunlight emitted by the Sun shifts towards blue when approaching and towards red when moving away. Earth's orbital speed affects the Doppler effect on green light, causing a greater shift towards red. The speed needed for a traffic light to appear red when it is actually green depends on the specific wavelength of green light.

Step-by-step explanation:

The Doppler effect causes a shift in the wavelength of sunlight as the Earth orbits the Sun.

When we approach the Sun, the color of sunlight emitted by the Sun shifts towards blue, and when we move away from the Sun, it shifts towards red.

So, the correct answer to Question 1 is A) It shifts towards blue when approaching, and towards red when moving away.

Earth's orbital speed affects the Doppler effect on green light. Higher orbital speed causes a greater shift towards red.

Therefore, the correct answer to Question 2 is B) Higher orbital speed causes a greater shift towards red.

The speed needed to perceive a traffic light as red when it is actually green depends on the specific wavelength of green light.

The speed needed is not independent of color perception and the Doppler effect.

So, the correct answer to Question 3 is B) The speed needed depends on the specific wavelength of green light.