Cobalt-60 is commonly used in radiation therapy because it emits (a) alpha rays (b) beta rays

As we know, the range of wavelength of visible radiation is from 400 nm to 700 nm. The radiation having wavelength greater than 700 nm is termed as infra-red radiations...

(d) The cause of chromatic aberration is that lens focusses different colours at different points.

The correct answer is (a) (c)  (a) the maximum intensity of radiation will be near the frequency 2v0 (c) the total energy emitted will increase by a factor of 16.

(b)  The minimum time after which it would be possible to work safely with this source is 12h.

(d) The active nucleus changes to one of its isobars after the beta decay.

(c) The recoiling nucleus at a time t after the decay as measured by the passenger is x .

X-rays has shortest wavelength.

X-rays < UV rays < Micro wave < Radio

As energy of X-ray photons is greater than UV. So KE increases.

(a) in the northern hemisphere