At the time of total solar eclipse, the spectrum of solar radiation would be

Options

A. A large number of dark Fraunhofer lines
B. A smaller number of dark Fraunhofer lines
C. No lines at all
D. All Fraunhofer lines changed into bright coloured lines

Answer

To solve the question regarding the spectrum of solar radiation during a total solar eclipse, we can follow these steps:

### Step 1: Understanding Solar Spectrum
The solar spectrum consists of a continuous spectrum with dark absorption lines, known as Fraunhofer lines, which are caused by the absorption of specific wavelengths of light by elements in the Sun's atmosphere.

**Hint:** Recall that the Fraunhofer lines are dark lines in the solar spectrum that correspond to specific wavelengths absorbed by elements in the solar atmosphere.

### Step 2: Effect of Total Solar Eclipse
During a total solar eclipse, the Moon completely covers the Sun. This means that the direct sunlight is blocked, and the solar atmosphere becomes more visible. The light from the solar corona, which is much hotter than the surface of the Sun, can be observed.

**Hint:** Consider how the blocking of sunlight affects what we can see in terms of the solar atmosphere and the light emitted from it.

### Step 3: Observing the Spectrum
When the solar corona is visible during a total solar eclipse, the spectrum observed will show bright emission lines instead of the usual dark absorption lines. This is because the intense heat of the corona causes it to emit light at specific wavelengths.

**Hint:** Think about how the emission of light from the corona contrasts with the absorption lines seen in the normal solar spectrum.

### Step 4: Conclusion
As a result, during a total solar eclipse, the Fraunhofer lines (dark lines) will be replaced by bright lines in the spectrum. This means that the correct answer to the question is that all Fraunhofer lines change into bright colors.

**Hint:** Remember that the appearance of bright lines indicates the emission of light rather than absorption.

### Final Answer
The correct option is: **All Fraunhofer lines change into bright colors.**