Explanation

To find the smallest Bragg scattering angle, we can use Bragg's law:

2d sin(θ) = nλ

where d is the distance between the atomic planes, θ is the scattering angle, n is an integer (which is 1 for the smallest angle), and λ is the wavelength of the X-ray.

Given:

d = 0.3 nm

λ = 0.03 nm

Rearranging Bragg's law to solve for θ, we get:

sin(θ) = λ / (2d)

= 0.03 nm / (2 × 0.3 nm)

= 0.05

θ = arcsin(0.05)

≈ 2.9°

Explanation

Polarization is a property of transverse waves, where the direction of vibration can be oriented in various directions.

Ultrasonic waves are longitudinal waves and cannot be polarized.

Explanation

All the listed fields (gravitational, electric, and magnetic) are conservative fields.

In conservative fields, the work done moving a particle between two points is independent of the path taken.

Explanation

Sunlight is composed of a spectrum of light that includes seven colors, which are:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

Explanation

• When light passes through a prism, refraction occurs, leading to the formation of a spectrum.
• Refraction is the bending of light as it passes through a medium with a different optical density.
• It causes the different wavelengths of light to separate and form a spectrum.

Explanation

The current produced by induced EMF depends on :

• Area of the coil
• Turns of the coil
• Strength of the magnetic field in which the coil rotates

Explanation

A hydrophone is an instrument designed to detect and record sound underwater.

It's essentially the underwater equivalent of a microphone and is commonly used in:

• Marine biology (e.g., studying whale calls or dolphin clicks)

• Submarine and naval operations (e.g., detecting other submarines or ships)

• Environmental monitoring (e.g., measuring underwater noise pollution)

• Underwater research (e.g., studying seismic activity or underwater volcanic eruptions)

Explanation

Without an atmosphere to scatter sunlight, there would be no diffusion of light.

Hence, the sky would appear black, just like it does from space.

Explanation

Thomas Edison is often credited as a key figure in the development of motion picture technology due to his invention of the Kinetoscope, an early motion picture exhibition device.

His contributions in the late 19th century laid the groundwork for the commercial motion picture industry, making him a pivotal figure in film history.

Explanation