15. of the following types of electromagnetic radiation travels at the greatest

Question

15. of the following types of electromagnetic radiation travels at the greatest speed in vacuum? A. Radio waves B. Visible light C X rays D. Gamma rays E All of these travel at the same speed 16. A pole stands in a river, half in and half out of the water. Another pole of the same length stands vertically on the shore at a place where the ground is level. The shadow cast by the pole in the river on the river bottom is: A slightly longer than the shadow of the pole on land B. much longer than the shadow of the pole on land C. shorter than the shadow of the pole on land D shorter than the shadow of the pole on land if the sun is high and longer if the sun is low E. the same length as the shadow of the pole on land Questions 17 and 18 refer to the five lenses A-E shown below. All of the lenses are nade of the same glass. Choose the lens which best answers each question below.

Explanation / Answer

According to the given problem,

15.) Ans: E All of these travel at the same speed

Reason: In vacuum/free space all the radiation behaves as light and travel with the speed of light, i.e c[3*108 m/s].

16.) Ans: C Shorter than the shadow of the pole on land.

Reason: As half of the pole is outside the water. The shadow falles thinner while travelling through the water bed due to refraction.So, the shadow of pole that is in the water falles shorter that the pole that is on the ground.

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