Regents Physics 3

Question 1

A 2 kg mass is lifted 5 m vertically. What is the gravitational potential energy gained? (g = 9.8 m/s²)

Accepted Answer

98 J

Answer

PE = mgh = 2 × 9.8 × 5 = 98 J.

Question 2

Which type of electromagnetic radiation has the highest frequency?

Accepted Answer

Gamma rays

Answer

Gamma rays have the highest frequency (and shortest wavelength) in the electromagnetic spectrum.

Question 3

A 1,500 W hair dryer is used for 2 minutes. How much electrical energy is consumed?

Accepted Answer

180,000 J

Answer

E = P × t = 1,500 W × 120 s = 180,000 J.

Question 4

In a series circuit with three resistors (2 Ω, 3 Ω, and 5 Ω), what is the total resistance?

Accepted Answer

10 Ω

Answer

In a series circuit, total resistance = R₁ + R₂ + R₃ = 2 + 3 + 5 = 10 Ω.

Question 5

A sound wave travels from air into water. Which property of the wave remains unchanged?

Accepted Answer

Frequency

Answer

Frequency is determined by the source and remains constant when a wave crosses a boundary; speed and wavelength change.

Regents Practice Test