Explanation

Steel is more elastic than rubber, glass, and wood.

Elasticity refers to the material's ability to return to its original shape after being deformed.

Steel has a higher modulus of elasticity (Young's modulus), meaning it can withstand greater stress and still return to its original shape.

Explanation

The aperture refers to the diameter of the lens through which light enters.

It controls the amount of light reaching the lens, affecting brightness and focus.

Explanation

Total internal reflection occurs when a light wave reaches the boundary between a denser medium and a rarer medium.

All of the light is reflected back into the denser medium.

Explanation

Security scanners used at night typically employ infrared (IR) technology to detect heat signatures, allowing for nighttime surveillance.

IR waves have a longer wavelength than visible light, making them ideal for detecting heat radiation from objects or people.

Explanation

G is the gravitational constant, also known as the universal gravitational constant.

It is a fundamental constant of nature that describes the strength of gravitational attraction between objects.

The currently accepted numerical value of G is 6.673 × 10^-11 Nm^2 kg^-2.

Explanation

The force on a moving charge in a uniform magnetic field depends on:

• Magnetic flux density (B): The strength of the magnetic field.
• The charge on the particle (q): The amount of charge on the particle.
• The speed of the particle (v): The velocity at which the particle is moving.

The force (F) on a moving charge in a uniform magnetic field is given by the Lorentz force equation: F = q (v x B)

Where x denotes the cross product.

Explanation

Sonar stands for "Sound Navigation and Ranging."

It uses high-frequency sound waves (ultrasonic waves) to detect and locate objects underwater

Explanation

In the C.G.S system (Centimeter-Gram-Second), the unit of mass is gram.

This system uses centimeter for length and second for time.

Explanation

In a line absorption spectrum, dark lines are due to transmittance.

In an absorption spectrum, dark lines appear against a continuous background.

These dark lines correspond to wavelengths of light that have been absorbed by the material through which the light passes.

The remaining wavelengths, which are not absorbed, are transmitted and create the bright background. 

Explanation

The fine ruling (track spacing) on a CD is about 0.5 micrometers (µm).

This microscopic spacing allows the CD to store large amounts of data through optical encoding.