Due to the Doppler effect, waves from an approaching source (moving toward the observer) are observed as having a shorter wavelength than when they were emitted. Which of the following pairs could represent the kind of radiation emitted from a source rapidly approaching Earth and the kind of radiation it is detected as on Earth? A
emitted as a gamma ray, observed as ultraviolet light

B
emitted as a microwave, observed as a radio wave

C
emitted as yellow light, observed as blue light

D
emitted as ultraviolet light, observed as infrared radiation

the answer is b

explanation:

the body's situation won't change the forces are equal opposit and on the same body

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.