# Physics

a) A distant spaceship carrying a red headlight,
emitting light with wavelength 600 nm, is heading
towards the earth. Observers on the earth detect the
light from the headlight as ultraviolet light with
wavelength 200 nm. What is the velocity of the
spaceship?
b) After the spaceship passed through the earth it
continues its flight. What frequency of light do
earth observers see?

1. 👍 0
2. 👎 0
3. 👁 178
1. a

1. 👍 0
2. 👎 0

## Similar Questions

1. ### physical chemistry

2. The retina of a human eye can detect light when radiant energy incident on it is at least 4.0X10-17 J. For light of 600-nm wavelength, how many photons does this correspond to?

2. ### Physics

Rank in order the following according to their speeds, from fastest (1) to slowest (5): (i) 425-nm-wavelength light through a pane of glass, (ii) 500-nm-wavelength light through air, (iii) 540-nm-wavelength light through water,

3. ### Science

1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave

4. ### English

14. The soldiers are issued (infrared) goggles to help them see in the dark. A. outside visible spectrum B. creating light by radiating heat C. emitting light by creating water vapor D. producing light by adding electrons to a

1. ### math

Marley drives to work every day and passes two independently operated traffic lights. The probability that both lights are red is 0.35. The probability that the first light is red is 0.48. What is the probability that the second

2. ### physics

when you see a traffic light turn red you apply the brakes until you come to a stop. if your initial speed was 12 m/s, and you were heading heading due west, what was your average velocity during braking? Assume constant

3. ### physics

A 75 W light source consumes 75 W of electric power. Typically only about 5% of this energy is emitted as visible light of wavelength 600 nm. (a) Calculate the frequency of the emitted visible light. (b) How many photons per

4. ### physics

A diamond's index of refraction for red light, 656 nm, is 2.410, while that for blue light, 434 nm, is 2.450. Suppose white light is incident on the diamond at 32.2°. Find the angles of refraction for red and blue light. red

1. ### Chemistry

An electron in a hydrogen atom could undergo any of the transitions listed below, by emitting light. Which transition would give light of the shortest wavelength? n=4 to n=2 n=3 to n=1 n=2 to n=1 n=4 to n=1

2. ### Chem

which of the following statements is true regarding electromagnetic radiation? Options: 1. electromagnetic radiation with a wavelength of 600 nm travels faster than that with a wavelength of 400 nm. 2. the frequency of

3. ### physical science

The speed of light is 3 „e 108 m/s (300,000,000 m/s). Red light has a wavelength of 7 „e 10-7 m (0.0000007 m). What is its frequency?

4. ### Physics

The wavelength of red light is about 7x10^-7m. The frequency of the red light reflected from a metal surface and the frequency of the vibrating electron that products it are the same. What is this frequency?