Find the wavelength of a photon which has 500.0 ev of energy.

2.5 x 10⁻⁹ m

Explanation:

E = Energy of photon = 500 eV = 500 x 1.6 x 10⁻¹⁹ J

c = speed of photon = 3 x 10⁸ m/s

λ = wavelength of photon = ?

Energy of photon is given as

inserting the values

λ = 2.5 x 10⁻⁹ m

so easy. just google the electromagnetic waves and it’ll pop up.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it