Explanation

• Radio waves have a much higher frequency than sound waves.
• Sound waves have frequencies in the range of 20 Hz to 20,000 Hz, while radio waves have frequencies in the range of thousands to billions of Hz (kilohertz to gigahertz).
• Radio waves are a type of electromagnetic wave, and their frequency is typically measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz).
• For example, FM radio broadcasts typically use frequencies between 88 MHz and 108 MHz, while AM radio broadcasts use frequencies between 535 kHz and 1605 kHz.

Explanation

• The relationship between current and potential difference (voltage) across a resistor is governed by Ohm's Law, which states that: I = V/R
• where I is the current, V is the voltage, and R is the resistance.
• This relationship is linear, meaning that if the voltage is reversed (i.e., the connections across the resistor are reversed), the current will also be reversed, but the graph will still be a straight line.

Explanation

• The Hall voltage (VH) is directly proportional to the magnetic flux density (B) and the current (I) flowing through the conductor, as well as the Hall coefficient (RH) of the material.
• The relationship is given by the formula: VH = RH × B × I

Explanation

The direction of the magnetic field around most objects or magnets is from the north pole to the south pole.

Explanation

The charge carriers in semiconductors are electrons and holes.

Explanation

The peak value of current in an AC circuit can be found by dividing the peak voltage by the impedance of the circuit.

Explanation

The angle made by a vector with the x-axis is typically denoted by the Greek letter θ.

Explanation

If there are 25 waves in a 5-second time period, the frequency of the waves can be calculated using the formula: Frequency= Number of waves/Time period = 25/5 =5 Hz

Explanation

The purpose of using an umbrella in the rain is to protect oneself from getting wet.

Explanation

The internal resistance of a device can be found by using additional information such as the voltage-current characteristic curve, as it provides a relationship between the voltage across the device and the current passing through it, allowing the determination of the internal resistance.