What is $h$ called in the equation $E=\frac{h c}{\lambda}$?
A. The speed of light
B. Einstein's constant
C. The EM constant
D. Planck's constant
Answer (2)
In the equation E = λ h c , the symbol h refers to Planck's constant. Therefore, the correct answer is D. Planck's constant. This constant is essential in quantum mechanics, linking the energy of photons to their wavelength.
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The equation E = λ h c relates energy to wavelength.
c represents the speed of light.
h represents Planck's constant.
The answer is D. Planck’s constant .
Explanation
Understanding the Problem The problem presents an equation E = λ h c and asks us to identify what h is called. We are given four options: A. The speed of light, B. Einstein's constant, C. The EM constant, D. Planck's constant.
Identifying the Constants The equation E = λ h c relates the energy of a photon ( E ) to its wavelength ( λ ). In this equation, c represents the speed of light, and h represents Planck's constant.
Selecting the Correct Option Therefore, the correct answer is D. Planck's constant.
Examples
Planck's constant is a fundamental constant in quantum mechanics. It appears in many equations, such as the equation for the energy of a photon, E = λ h c , where E is the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength. This equation is used in various applications, such as understanding the photoelectric effect and the behavior of blackbody radiation. For example, in medical imaging, understanding the energy and wavelength of photons is crucial for techniques like X-rays and PET scans.
