A gas at 300 K occupies 2 L. If the temperature is raised to 600 K at constant pressure, the volume becomes:
A. 4 L
B. 6 L
C. 1 L
D. 2 L
Answer: Option A
Solution (By JKSSB Mock Tests)
Charles' law: V₁/T₁ = V₂/T₂. V₂ = V₁ × T₂/T₁ = 2 L × 600 K / 300 K = 4 L. Volume doubles as absolute temperature doubles. Note: must use Kelvin, not Celsius. (600 K = 327°C). If mass and pressure are constant, volume is directly proportional to absolute temperature.
Explanation:
Henri Becquerel discovered radioactivity in 1896 while studying uranium salts. Marie and Pierre Curie further investigated radioactive elements. Rutherford studied alpha/beta radiation.
Explanation:
Bohr's model (1913) could accurately predict the line spectrum of hydrogen and hydrogen-like ions (single-electron species like He⁺, Li²⁺) by introducing quantized energy levels and angular momentum. It failed for multi-electron atoms due to electron-electron interactions. The model explained the Balmer series of hydrogen. Modern quantum mechanics with Schrödinger equation replaced it. Bohr also introduced the concept of stationary orbits.
Explanation:
Atomic number 15 is phosphorus. Electronic configuration: 2, 8, 5. Number of shells = 3 (Period 3). Valence electrons = 5, so it is in group 15 (10+5) for p-block elements. Group 5 is for d-block. Thus Group 15, Period 3.
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