5 and 6 please :) A whistle of frequency 4312 Hz moves in a circle of radius 106

Question

5 and 6 please :)

A whistle of frequency 4312 Hz moves in a circle of radius 106.0 cm at period of 1.05s. What are the lowest and the highest frequencies heard by a listener a long distance away, at rest with respect to the center off the circle? Electromagnetic waves include radio waves, microwaves, infrared, visible, ultraviolet, x-rays, and gamma rays. Which of the following are true? They have different wavelengths. They have different frequencies. They propagate at different speeds through a vacuum depending on their frequency. They propagate at different speeds through non-vacuum media depending on the material in which they travel. They require different media to propagate. From wikipedia.org On December 13, 2011 when the Foo Fighters played in New Zealand, their concert was recorded on the GeoNet seismograph for the duration of their 2 1/2 hour set (although the weight of the fans dancing was a major contributing factor to this). This is not the only instance of the Foo Fighters playing at extreme volumes, their performance at Tennent's vital 2012 in Northern Ireland drew noise complaints from up to twelve miles away.

Explanation / Answer

Q5. electromangetic waves have same speed as speed of light but they have different wavelengths and hence different frequencies

through any medium, speed of the wave gets reduced by the refractive index.

so through different material, speed becomes different

they can propagate through different mediums

so option a, option b and option d are correct.

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