Explanation

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

 He belonged to France.

Explanation

• The time period of a charged particle in a uniform magnetic field:
• Formula:T=2πm/ qB
• • Here, m = mass, q = charge, and B = magnetic field strength.
• Notice the velocity v does not appear in this formula — the period depends only on mass, charge, and field strength.

Explanation

The particle's path is a helix.

Reasoning:

• Velocity has two components:
  • Parallel to the fields → electric force accelerates it along the axis
  • Perpendicular to the fields → magnetic force makes it circle around the axis
• Combined → helical path (with changing pitch as it speeds up/slows down)

Explanation

Area of wall = Height × Length
= 8 × 24
= 192 ft²

Given: 10 gallons cover 75 ft²

Required paint

$$frac{192 times 10}{75} = 25.6$$

Explanation

Formula: Efficiency = 1 − (T₂/T₁)

Convert to Kelvin:

27°C = 300 K

277°C = 550 K

Efficiency = 1 − (300/550)

= 45.45%