HELP ASAP PLEASE i really need help! :( Please help me this is due at 8:45 please

The photoelectric effect is an electron coming out of a metal because of electromagnetic radiation  

One type of electromagnetic radiation is light  

Frequency (f): the number of waves / second

Can be formulated :

v=fast wave propagation ⇒ speed of light =3.10⁸ m/s

λ= Wavelength

The energy can be formulated as

 E = h x f

Where

E = energy of light, J

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves, Hz

1. λ = 4.82 x 10⁻¹⁰ m

the frequency =:

2. The energy

3. λ = 4.32 x 10⁻⁷ m

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

i'm pretty sure it is letter c.) car