Waves – Question 4

(a) The new Tetra communications system to be used by the police transmits digital signals using microwaves of wavelength 75 cm.

The signals travel through the air at 300 000 000 m/s.

(i) What is a digital signal?

Waves – Question 4 was last modified: October 13th, 2015 by Olly Wedgwood

Waves – Question 3

(a) The wavelengths of four different types of electromagnetic wave, including visible light waves, are given in the table.

waves-3a

Waves – Question 3 was last modified: September 12th, 2015 by Olly Wedgwood

A headline from a recent magazine article is shown below.

Waves – Question 1 was last modified: August 6th, 2015 by Olly Wedgwood

(a) The diagram represents part of the electromagnetic spectrum.

Waves – Question 2 was last modified: August 6th, 2015 by Olly Wedgwood