4. calculate the wavelength of radiation with a frequency of 8.0 x 104 hz.

The wavelength of  wave is 0.375 × 10⁴ m.

Explanation:

Given data:

Wavelength of x-ray = ?

frequency of x-ray = 8×10⁴ Hz

Solution:

speed = Wavelength × frequency

Wavelength = speed /  frequency

c = 3 × 10⁸ m/s

λ= c / f

λ = 3 × 10⁸ m/s /8×10⁴ s⁻¹

λ = 0.375 × 10⁴ m

The wavelength of  wave is 0.375 × 10⁴ m.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !