Which of these events is an example of the doppler shift?
the amplitude of a wave on a string increases as the frequency decreases.
the amplitude of sound from a tuning fork decreases due to damping.
the frequency of light from a star increases as it moves toward us.
the intensity of an electromagnetic wave increases with the field strength.
the velocity of an electromagnetic wave changes as its medium changes.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Which atomic model was proposed as a result of j. j. thomson’s work?