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Light Emission: Sun, Stars, and Moon

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Questions and Answers

Which of these objects emits its own light?

A mirror

The stars

The moon

The sun (correct)

What is the main difference between the sun and the moon in terms of how they produce light?

The sun reflects light, while the moon emits light

The sun has a higher temperature than the moon

The sun emits light, while the moon reflects light (correct)

The sun has a lower temperature than the moon

What is the approximate temperature of the sun's photosphere, where visible light is emitted?

200°F

20,000°F

-200°F

10,000°F (correct)

What is the approximate temperature of the moon's surface in the sun?

200°F (D) Signup and view all the answers

Which of the following objects does not emit its own light?

The moon (D) Signup and view all the answers

Why can we look directly at the moon without special equipment, but not at the sun?

Looking directly at the moon does not damage our eyes, but looking directly at the sun can cause blindness (D) Signup and view all the answers

Which of the following is the best explanation for why we can look at stars without going blind?

Stars are much farther away than the sun (B) Signup and view all the answers

Why does a light bulb filament burn your finger when touched?

The filament has a temperature high enough to excite and emit electrons as visible light. (C) Signup and view all the answers

Why does touching a friend's arm not burn your finger?

The arm's temperature is not high enough to excite electrons and emit visible light. (C) Signup and view all the answers

According to the passage, what is the minimum temperature required for an object to emit visible light?

Around 100 Kelvin or over 700°F (D) Signup and view all the answers

How can scientists determine if an object is emitting or reflecting light?

By measuring the object's temperature and comparing it to the wavelength of associated light. (A) Signup and view all the answers

Why does a leaf outside appear green?

The leaf reflects green light from the sun while absorbing other wavelengths. (C) Signup and view all the answers

Which of the following is an example of an object that emits light due to electricity?

A lightning bolt in the sky (D) Signup and view all the answers

According to the passage, how can our eyes determine if an object is emitting or reflecting light?

Emitted light will appear brighter and cause eye strain or discomfort when viewed. (A) Signup and view all the answers

Which of the following statements is true about objects that reflect light?

They can cast shadows if the reflected light source is bright enough. (D) Signup and view all the answers