B.1 Thermal energy transfers Quiz
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5 questions, one answer each
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1. How much energy is needed to melt 0.20 kg of ice at 0 °C? (specific latent heat of fusion = 3.3 × 10⁵ J kg⁻¹)
- A. 6.6 × 10⁴ J
- B. 1.65 × 10⁶ J
- C. 3.3 × 10⁵ J
- D. 6.6 × 10³ J
2. Which quantity is directly proportional to the absolute temperature of an ideal gas?
- A. Average speed of the particles
- B. Average kinetic energy of the particles
- C. Density of the gas
- D. Intermolecular potential energy
3. A star's peak wavelength is 500 nm. What is its surface temperature?
- A. 5800 K
- B. 1.45 × 10⁻⁹ K
- C. 580 K
- D. 1.7 × 10⁴ K
4. The distance to a star doubles while its luminosity is unchanged. What happens to its apparent brightness?
- A. It halves
- B. It doubles
- C. It falls to a quarter
- D. It is unchanged
5. A metal rod's length is doubled, keeping the same temperatures at its ends. What happens to the rate of conduction?
- A. It doubles
- B. It halves
- C. It is unchanged
- D. It quarters