Electromagnetic Waves - SS2 Physics Past Questions and Answers - page 3

We can use the equation λ = c/f

Substituting the values, λ = (3 × 108 m/s)/(2 × 1015 Hz).

Simplifying the expression, λ = 1.5 × 10-7 m or 150 nm.

We can use the equation f = c/λ

Substituting the values, f = (3 × 108 m/s)/(500 × 10-9 m).

Simplifying the expression, f = 6 × 1014 Hz.

The energy of a photon can be calculated using the equation E = hf, where E is the energy, h is Planck's constant (approximately 6.63 × 10-34 J·s), and f is the frequency

Substituting the values, E = (6.63 × 10-34 J·s) × (1012 Hz).

Simplifying the expression, E = 6.63 × 10-22 J.

Radio waves are extensively used in communication systems for various purposes. AM/FM radio broadcasting is one of the prominent applications where radio waves are used to transmit audio signals over long distances. Radio waves are also employed in television broadcasting, allowing the transmission of visual and audio signals. Additionally, radio waves are used in mobile communication networks, enabling wireless communication between devices such as cell phones. Another application is radar systems, which use radio waves for detecting and tracking objects, including aircraft, ships, and weather patterns.

Microwaves play a crucial role in various areas of modern technology. In cooking, microwave ovens utilize microwaves to heat food quickly and efficiently. Microwaves are also used in wireless communication systems, including satellite communication, Wi-Fi networks, and Bluetooth devices. They enable the transmission of data and signals over short and long distances. Furthermore, microwaves are utilized in weather forecasting through the use of weather radar systems. These systems use microwaves to detect precipitation and analyze weather patterns, aiding in accurate forecasting.