In 1969, Apollo 11 astronauts placed a special reflector on the Moon. This reflectorsends light back in the direction from which it came, regardless of its angle ofincidence. With the Moon about 384 000 km from Earth, how long would it take alight pulse sent from Earth to reach the lunar reflector and then return to Earth?A. 1.28 sB. 2.56 sC. 3.85 sD. 5.13 s6. The chloroplasts within the leaves of green plants contain the pigment chlorophyl.This pigment provides energy for photosynthesis by absorbing the energy containedin the photons ofA. green lightB. red lightC. violet lightD. red light and violet light7. What kind of electromagnetic radiation is responsible for sunburns?A. UVA lightB. UVB lightC. visible lightD. infrared light

The speed of light is approximately 300,000 km/s. To find the time it takes for light to travel to the moon and back, we need to double the distance between the Earth and the Moon (because the light is travelling there and back), and then divide by the speed of light. So, (2 * 384,000 km) / 300,000 km/s = 2.56 seconds. So, the answer is B. 2.56 s.

Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion. However, it does not absorb green light well, which is why leaves appear green. So, the answer is D. red light and violet light.

Sunburns are primarily caused by ultraviolet (UV) radiation from the sun. There are three types of UV radiation: UVA, UVB, and UVC. UVC is the most dangerous, but it is completely blocked by the Earth's atmosphere. UVB is the type that typically causes sunburn. So, the answer is B. UVB light.