It Is Known That Birds Can Detect the Earth's Magnetic $1.2$

question 281

Multiple Choice

It is known that birds can detect the earth's magnetic field, but the mechanism of how they do this is not known. It has been suggested that perhaps they detect a motional emf as they fly north to south, but it turns out that the induced voltages are small compared to the voltages normally encountered in cells, so this is probably not the mechanism involved. To check this out, calculate the induced voltage across the wingtips of a wild goose with a wingspan of $1.2$ mif it is flying directly south at $13 \mathrm {~m} / \mathrm { s }$ at a point where the earth's magnetic field is $5.0 \times 10 ^ { - 5 } \mathrm {~T}$ directed downward from the horizontal by $40 ^ { \circ }$ .

• A) \(0.060 \mathrm { mV }\)
• B) \(0.78 \mathrm { mV }\)
• C) \(0.50 \mathrm { mV }\)
• D) \(0.25 \mathrm { mV }\)
• E) \(0.60 \mathrm { mV }\)

---

Definitions:

Removes Carbon

The process of removing carbon typically refers to extracting carbon dioxide (CO2) from the atmosphere or emissions, a critical action for reducing global warming and climate change.

Atmosphere

The layer of gases surrounding a planet, which for Earth is composed primarily of nitrogen and oxygen and protects it from the sun's radiation and space debris.

Photosynthesis

The process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.

Carbon

A chemical element with symbol C and atomic number 6, essential to all known life forms and the basis of organic chemistry.