I found an answer from www.slac.stanford.edu

Searching for Low-Mass Dark Matter **with** SuperCDMS Soudan ...

SuperCDMS is a direct-detection dark matter (DM) **experiment** that uses
cryogenically ... 2.3 Important time **and frequency values** for charge (e-/h+) **and**
phonon ...

For more information, see Searching for Low-Mass Dark Matter **with** SuperCDMS Soudan ...

I found an answer from www.nobelprize.org

The **dual nature** of **light** as reflected in the Nobel archives

Dec 2, 1999 **...** A particle on the classical view is a concentration of **energy** and other ... But **wave**
**theory** was needed to explain interference where the **light** ... the particle **nature** of
**light**: 1) the **photoelectric effect** and 2) the Compton scattering of X-rays. ...
**Einstein** repeated the statistical **calculation with Planck's formula** as ...

For more information, see The **dual nature** of **light** as reflected in the Nobel archives

Given that

\frac{\text{ slope of cut-off voltage }}{\text{ frequency if incident light }} = \frac{V}{\upsilon} = 4.12 * 10^{-15}Vs

Charge of electron e = 1.6 * 10^{-19}

Planck's constant h = ?

Step 1: Set up an equation for the Planck's constant

We know that

By conservation by law, Energy E = eV...........................(1)

Where, e - electric charge and V - potential of electrons

Energy of proton E=h\upsilon........................(2)

Where, h - Planck's constant and \upsilon - frequency

From equation (1) and (2)

h \upsilon = eV

Planck's constant h = \frac{eV}{ \upsilon} = e * \frac{V}{ \upsilon}

Step 2: Plug in the given values in the above equation

h = 1.6 * 10^{-19} * 4.12 * 10^{-15}

h = 6.592 * 10^{-34}

Therefore, Planck's constant value h = 6.592 * 10^{34} Js