Deepika and Rajesh are heating water for an experiment. Deepika has kept her beaker containing water near the wick in the yellow part of the candle flame while Rajesh has kept his beaker in the outermost part of the flame. Which of the observations do you think is correct?

Options

A. Rajesh's beaker gets heated faster and a black ring is deposited on Deepika's beaker.
B. Both the beakers become black and take equal time for heating the water.
C. Deepika's beaker gets heated faster and gets a black ring.
D. Rajesh's beaker gets heated faster and gets a black ring.

Explanation

To solve the question regarding Deepika and Rajesh heating water using different parts of a candle flame, we need to analyze the situation based on the characteristics of the flame zones.

### Step-by-Step Solution:

1. **Understanding the Candle Flame**:
- A candle flame has different zones: the inner zone (near the wick) is typically yellow and luminous, while the outer zone is blue and non-luminous. The yellow part indicates incomplete combustion, while the blue part indicates complete combustion.

**Hint**: Remember that the color of the flame indicates the type of combustion occurring.

2. **Position of Beakers**:
- Deepika places her beaker in the yellow part of the flame (luminous zone), which has limited oxygen supply. This results in incomplete combustion, producing less heat and unburnt carbon particles.
- Rajesh places his beaker in the blue part of the flame (non-luminous zone), which has a sufficient supply of oxygen, leading to complete combustion and more heat generation.

**Hint**: Think about how the availability of oxygen affects the burning process and the heat produced.

3. **Heat Transfer**:
- Since Rajesh's beaker is in the hottest part of the flame (the blue zone), it will heat the water more quickly compared to Deepika's beaker, which is in the cooler yellow zone.
- The yellow flame will also deposit soot (black carbon) on Deepika's beaker due to incomplete combustion.

**Hint**: Consider how the temperature of the flame zones affects the rate of heating.

4. **Observations**:
- The correct observation is that Rajesh’s beaker heats faster because it is in the hotter, blue part of the flame, while Deepika’s beaker will not only heat slower but also develop a black ring due to soot deposition from the yellow flame.

**Hint**: Focus on the outcomes of where each beaker is placed in relation to the flame zones.

### Conclusion:
The correct observation is that **Rajesh's beaker gets heated faster and Deepika's beaker develops a black ring due to soot deposition** from the yellow flame.