Explanation

Maxwell's equations led to the derivation of the speed of electromagnetic waves, including light.

The speed of light (c) is given by C = 1/√μ₀ε₀, where μ₀ is the permeability of free space and ε₀ is the permittivity of free space.

Explanation

The frequency heard by the observer as the car approaches is given by the Doppler effect formula:

f' = f * (v / (v - v_s))

where f = 500 Hz, v = 340 m/s, and v_s = 20 m/s.

f' = 500 * (340 / (340 - 20))

= 500 * (340 / 320)

= 500 * 1.0625

= 531.25 Hz

Explanation

دعا کو قرآن و حدیث میں عبادت کا مغز قرار دیا گیا ہے۔

حضرت محمد ﷺ نے فرمایا: "الدُّعَاءُ مُخُّ العِبَادَةِ" یعنی "دعا عبادت کا مغز ہے"۔

Explanation

"The" is used when referring to a specific group, like "The Europeans" as a general class.

It's appropriate here to describe a known or general characteristic of Europeans.

Explanation

The correct word is "something" because it refers to an unspecified item or drink in this context.

"Something to drink" is the proper expression when offering a drink.

Explanation

The Nearctic region includes North America, where animals like prairie dogs, buzzards, opossums, and mountain lions/dogs are commonly found.

It is one of the major biogeographic realms.

Explanation

The ABO blood group gene is located on chromosome number 9.

It codes for glycosyltransferase enzymes that determine blood type.

Explanation

The Experimental method requires hands-on activities and individual attention, which is difficult in overcrowded classrooms.

It is less practical compared to methods like Lecture or Demonstration in large groups.

Explanation

A terrestrial food chain typically starts with a producer (like grass), followed by primary consumers (herbivores like grasshoppers), then secondary consumers (like snakes), and ends with top predators (like eagles).

This sequence shows the correct flow of energy from plants to top carnivores.

Explanation

In SHM, total energy (kinetic + potential) remains constant if no external force or damping is present.

Though kinetic and potential energy change with time, their sum stays the same throughout the motion.