Light travels from water (with index of refraction 1.33) into air (index of refraction 1.00).

which of the following statements about this light is true? (there may be more than one correct choice.)
a. the light has the same frequency in the air as it does in the water.
b. the light travels faster in the air than in the water.
c. the light has the same wavelength in the air as it does in the water.
d. the light has the same speed in the air as in the water.
e. the wavelength of the light in the air is greater than the wavelength in the water.

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.

earth's neighboring galaxy, the andromeda galaxy, is a distance of 2.54×107 light-years from earth. if the lifetime of a human is taken to be 70.0 years, a spaceship would need to achieve some minimum speed min to deliver a living human being to this galaxy.

a. (6mp + 8mn) - mc - 14