1. Sound waves are electromagnetic waves. 2. A parabolic dish antenna is a(n) __

Question

1. Sound waves are electromagnetic waves.

2. A parabolic dish antenna is a(n) _______ antenna.

3. _______ are used for cellular phone, satellite, and wireless LAN communications.

4. An image is sampled to give a 128x128 array of pixels. If this digital image is stored with 64 gray levels, it requires ________bits of storage. (Hint: how many bits in a sample gives 64 possibilities?)

5. For FM radio signals, which statement is correct?

6. A WiFi radio wave with frequency of 2.4 GHz has a wavelength of about _________.

Explanation / Answer

1. False
Sound waves are examples of mechanical waves while light waves are examples of electromagnetic waves.

2. Unidirectional

3. The answer is Microwaves. But the option is not given. Better check the options again.

4. 98304
6 bits in a sample gives 64 possibilities. Total size = 128*128*6

5. Changes in the carrier frequency carry the information, and amplitude stays the constant.

6. 12.5 cm
=c where is the wavelength, is the frequency and c is the speed of light.

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