Physics — Semester B Practice

Question 1 of 10

TEKS 8E-9DEasy Calc Word

What is the energy of a photon with frequency 5.0 × 10¹⁴ Hz? Use h = 6.63 × 10⁻³⁴ J·s.

A5.0 × 10¹⁴ J

B1.3 × 10¹⁹ J

C3.3 × 10⁻¹⁹ J

D3.3 × 10⁻²⁰ J

Explanation

📌 E = hf = (6.63 × 10⁻³⁴)(5.0 × 10¹⁴) = 33.15 × 10⁻²⁰ = 3.3 × 10⁻¹⁹ J. Common wrong answers come from wrong sign of exponent, reported f, and off by factor of 10.

Question 2 of 10

TEKS 8A-8DEasy Calc Word

A wave has a wavelength of 0.5 m and a frequency of 340 Hz. What is its speed?

A0.0015 m/s

B170 m/s

C680 m/s

D68 m/s

Explanation

📌 v = λf = 0.5 × 340 = 170 m/s. Common wrong answers come from dividing, multiplying wrong, and reciprocal.

Question 3 of 10

TEKS 6A-6EEasy Word

Which of the following is a good conductor of electricity?

AGlass

BCopper

CWood

DRubber

Explanation

📌 Metals are conductors because their electrons can move freely. Copper is one of the most-used conductors. Wood, rubber, and glass are insulators.

Question 4 of 10

TEKS 6A-6EMedium Calc Word Diagram

In the circuit shown, a 12 V battery drives current through two resistors in series: R₁ = 4 Ω and R₂ = 8 Ω. What is the current through R₁?

A1.5 A

B0.5 A

C1.0 A

D3.0 A

Explanation

📌 Series: R_total = 4 + 8 = 12 Ω. Current is the same everywhere: I = V/R = 12/12 = 1.0 A. Common wrong answers come from only used R₂, split difference, and forgetting to add resistors (used just R₁: 12/4 = 3).

Question 5 of 10

TEKS 6A-6EEasy Calc Word Diagram

The diagram shows electric field lines around two point charges. What is the sign of each charge?

AA is +, B is +

BA is −, B is +

CA is −, B is −

DA is +, B is −

Explanation

📌 Field lines EMERGE from positive charges and CONVERGE into negative charges. In the diagram, arrows point OUT of A (so A is positive) and INTO B (so B is negative). Common wrong answers come from both would show outward arrows, reversing, and both would show inward arrows.

Question 6 of 10

TEKS 8E-9DEasy Calc Word Diagram

The diagram shows energy levels of an atom. An electron transitions from level n = 3 to level n = 1. What happens?

AThe atom absorbs a photon of energy hf

BThe atom loses one proton

CThe atom emits a photon with energy equal to E₃ − E₁

DNothing happens

Explanation

📌 When an electron drops from a higher energy level to a lower one, the atom emits a photon whose energy = E_higher − E_lower. Frequency of the emitted photon is set by hf = ΔE. This is the origin of emission spectra. Common wrong answers come from absorption is the reverse process, protons are in the nucleus, not affected by electron transitions, and emission happens.

Question 7 of 10

TEKS 8GEasy Calc Word Diagram

The ray diagram shows an object placed farther than 2f from a converging (convex) lens. What is TRUE of the image?

AReal, inverted, and reduced

BVirtual, upright, and enlarged

CReal, upright, and enlarged

DVirtual, inverted, and same size

Explanation

📌 Object beyond 2f of a converging lens: image is on the OPPOSITE side (real), inverted (flipped), and reduced (smaller than object). This is how a camera lens works. Common wrong answers come from describes a magnifying glass (object within f), converging lens never produces upright real image, and nonsense combination.

Question 8 of 10

TEKS 6A-6EEasy Word

A 12 V battery is connected across a 4 Ω resistor. What is the current through the resistor?

A0.33 A

B16 A

C3.0 A

D48 A

Explanation

📌 Ohm's law: I = V/R = 12/4 = 3.0 A. Common wrong answers come from reciprocal (R/V), multiplying V × R, and adding V + R.

Question 9 of 10

TEKS 8A-8DEasy Calc Word

The frequency of a wave is 500 Hz. What is its period?

A500 ms

B2 ms

C0.5 s

D500 s

Explanation

📌 T = 1/f = 1/500 = 0.002 s = 2 ms. Common wrong answers come from t = f, wrong reciprocal, and 500 ms is 0.

Question 10 of 10

TEKS 6A-6EEasy Calc Word Diagram

The diagram shows two point charges. Charge A has +4 μC and charge B has +2 μC. They are separated by 0.10 m. What is the direction of the force on charge B due to charge A?

AToward A (attractive)

BPerpendicular to the line AB

CZero force

DAway from A (repulsive)

Explanation

📌 Both charges are positive (like charges). Like charges REPEL. So force on B points AWAY from A. Magnitudes are given: F = kq_A q_B/d² = (8.99×10⁹)(4×10⁻⁶)(2×10⁻⁶)/(0.10)² = 7.19 N, but the question asks direction only. Common wrong answers come from opposite direction, force is nonzero, and force is along line, not perpendicular.

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