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Sunlight reaching the earth

How long does it take for sunlight to reach the earth?

Subject:

Physics

Topic:

Modern Physics

Posting ID:

12312

OTA ID:

103906

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Electromagnetic spectrum

Using the electromagnetic spectrum, estimate the following: 1. the wavelength that separates ultraviolet light from x-rays 2. the wavelength that separates long-wave radio waves from short-wave radio waves.

Subject:

Physics

Topic:

Modern Physics

Posting ID:

12313

OTA ID:

103139

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Light years

An astronomical unit of distance is the light-year, which is the distance light travels in one year. Compute this distance in meters. How many meters away is a star at a distance of 4 light-years from the earth?

Subject:

Physics

Topic:

Modern Physics

Posting ID:

12314

OTA ID:

103300

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Photon frequency and wavelength

A photon has an energy of 2.4eV. Find its frequency and its wavelength.

Subject:

Physics

Topic:

Modern Physics

Posting ID:

12315

OTA ID:

102389

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Photoelectric emission and wavelength

What is the maximum wavelength of light that will lead to photoelectric emission from copper. The work function of copper is 4.5eV.

Subject:

Physics

Topic:

Modern Physics

Posting ID:

12317

OTA ID:

103997

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