physics

The diagram below illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of longest wavelength?

A. I B. II C. III D. IV Correct Answer: Option A - I

5 years ago

Bohr’s atomic model proves most successful for the explanation of the… Which of the statements above is/are correct?

I. structure of the hydrogen atom; II. line spectra of the hydrogen atom; III. Multi-electron atoms. A. I only B.…

5 years ago

A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm‾ ¹. Calculate the work done on the charge

A. 5.0 x 10^6J B. 1.0 x10^-6J C. 5.0 x10^-7J D. 1.0 x 10^-2J Correct Answer: Option B - 1.0…

5 years ago

A 10- Ω coil takes 21 s to melt 10g of ice at 0°C. Assuming no heat losses, determine the current in the coil. (Specific latent heat of fusion of ice = 336 Jg-1)

A. 16A B. 5A C. 4A D. 3A Correct Answer: Option C - 4A

5 years ago

In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity?

A. 20 N C¯¹ B. 8 N C¯¹ C. 5 N C¯¹ D. 2 N C¯¹ Correct Answer: Option A…

5 years ago

The voltage and current in the primary of a transformer are 200V and 2A respectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.

A. 100% B. 90% C. 75% D. 50% Correct Answer: Option C - 75%

5 years ago

Magnetic flux density is defined as the?

A. total number of magnetic lines of force surrounding a magnet B. number of magnetic lines of force per unit…

5 years ago

A resistance wire of length 2 m and of uniform cross-sectional area 5.0 x 10^-7 m² has a resistance of 2.2 Ω. Calculate its resistivity.

A. 1.8 x 10^-7Ωm B. 5.5 x 10^-7Ωm C. 1.8 x 10^-7Ωm D. 5.8 x 10^7Ωm Correct Answer: Option B…

5 years ago

The parts of a bar magnet at which the magnetic effect is strongest are called the?

A. poles B. neutral points C. magnetic declinations D. magnetic meridians Correct Answer: Option A - poles

5 years ago

Using the diagram below, calculate the effective capacitance of the circuit?

A. 1.56μf B. 3.00μF C. 3.71μF D. 9.00μF Correct Answer: Option D - 9.00μF

5 years ago
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