7. How fast would a motorist have to be traveling for a yellow (A = 590 nm) traffic light to appear green (λ = 550 nm) because of the Doppler shift? Should the motorist be traveling toward or away from the traffic light to see this effect?

You are at a large outdoor concert, seated 300 m from the speaker system.The concert is also being broadcast live via satellite. Consider a listener 5000km away from the satellite. Who hears the music first, and by what time difference? (v sound = 340 m/s, v radio = 3x10 8 m/s)

# 13. A distant star is moving away from the earth. Is the speed of light from that star increased, decreased, or is it unchanged? A) decreased B) increased C) unchanged B O A C

1) A pulse of light takes 3.00 ns to travel through air from an emitter to a detector. When a piece of transparent material with a length of 35.0 cm is introduced into the light's path, the pulse takes 3.40 ns to travel that same distance. The piece of transparent material is held so that the pulse never changes direction. What is the speed of light in the transparent material? (in ns please) 2) A small red LED  is placed on the principal axis 6.00 cm from a concave mirror that has a radius of curvature of 14.0 cm. The LED can be considered to be a point source. Find the image distance for the image of the LED that is created by the mirror. (in cm please. Image attached below) I appreciate the help. I've attempeted the first question multiple times and always end up with the wrong answer so I don't know what equation to use.

There was a major collision of an asteroid with the Moon in medieval times. It was described by monks at Canterbury Cathedral in England as a red glow on and around the Moon. How long (in s) after the asteroid hit the Moon, which is 3.93 X 105 km away, would the light first arrive on Earth? S

The intensity of the light emitted by our sun peaks at about 550 nm. The frequency of this light is equal to 5.45x10^____. (Give the exponent.)

2. A satellite orbiting the Earth is powered by photovoltaic (“solar”) panels that convertlight energy to electricity with a conversion rate of 15.0%. Telemetry from the satelliteindicates that the panels are supplying a peak power output of 3.60 kW, and the specificationsof the panels state that they have 16 m^2 of light-collecting surface area. The radius of theSun and its distance from Earth have long been known to be 6.96 ×10^8 m and 1.50 ×10^11m, respectively. Assume the Sun radiates approximately as a blackbody and calculate thesurface temperature of the Sun.

The distance from earth to the nearest star is about 4 x 1016 meters. How long would it take a radio signal traveling at the speed of light, 3.0 x 108 m/s, to make a one-way trip to this star?

A group of students was at a graduation party in one student’s backyard.  The star of the basketball team, who is very tall, arrived late.  As he walked across the back yard his head bumped into one light in a strand of part light.  All of a sudden all of the party lights went out.  Explain why all of the lights in the strand went out when one light was bumped.

need help please