Planck's Constant

[Husnia Safi - 1K]

When would I need to use Planck's constant?

[Andrea Grigsby 1I]

whenever you need to use an equation with the constant "h" in it.
eg E=hv

good thing is, the value is on the formula sheet so we don't have to memorize it :)

[Ruohan Sun 3I]

when using the equations E=hν and λ=h/p

[Gurpreet Khamba 1J]

It can also be used to find E (Energy) when the frequency is not known. To do this, you would use the relation v has with c (speed of light) and λ (wavelength).
This results in the equation: E = (hv)/λ
The constant is also used in the uncertainty principle.

Max Planck received a Nobel Prize in 1981 "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta".

[Michelle Lu 1F]

Plank's constant is used in a variety of common equations such as E = (hv)/λ and λ=h/p and it was a constant that was found experimentally.

[Susie Lee 2I]

Whenever you see "h" in a formula! Don't get it confused with "p"!!

[Adrian Lim 1G]

Planck's constant is a set number for the constant h. It is used in formulas, such as E = hv. It will be given to you on the formula sheet. Just to reiterate the above reply, don't get it confused with p. p stands for momentum and is equal to the mass * velocity.

[Josh Moy 1H]

Use planck's constant whenever you need to use/derive equations involving the variable h

[Jasmin Tran 1J]

Also, make sure the variable is h and not "h bar" (the h with a cross on the top), because h bar refers to the uncertainty principle and has a different value than h, which is Planck's constant.

[Patricia Macalalag 2E]

Don't forget that the units for Planck's Constant are joules times seconds!

[Christy Zhao 1H]

You also use Planck's constant in the equation relating the kinetic energy of an ejected e- to the energy of an incident photon.