Atypical gamma ray emitted from a nucleus during radioactive decay may have an energy of 320kev. what is its wavelength in angstroms? a) 0.39 angstroms
b) 0.039 angstroms
c) 320 angstroms
d) 390 angstroms
e) 0.093 angstroms

The wavelength is 0.39 angstroms.

(A) is correct option.

Explanation:

Given that,

Gamma ray emitted from a nucleus during radioactive decay may have an energy = 320 keV

We need to calculate the wavelength

Using formula of energy

Where, E = energy

h = plank's constant

c = speed of light

Put the value into the formula

Hence, The wavelength is 0.39 angstroms.

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000