Wave Motion

Consider the following and arrange these in increasing order of frequency : I. X-rays II. Visible rays III. Infrared rays IV. Radio waves Select the correct answer using the code given below : Code :

Long radio waves are reflected by which of the following layer of Earth's surface –

The Earth's atmosphere is mainly heated by which one of the following?

Which one of the following statements is not true about cosmic rays?

Waves used for telecommunication are –

Television viewers using dish antenna to receive satellite signals do not receive signals during rain because : 1. of small size of antenna. 2. rain droplets absorb the energy of radio waves. 3. rain droplets disperse the energy of radio waves from their original direction. Which of the above statements are correct?

Television signals cannot be received beyond a certain distance because :

CT Scan is done by using –