A radioactive source emits X–rays of very short wav...
A radioactive source emits X–rays of very short wavelength (10 -13m ). what is the frequency of these rays?
2 × 1018HZ
3 × 10 19HZ
3 × 1021HZ
3 × 10-19HZ
Correct answer is C
Wavelength(λ)=10−13m
Speed of X-ray = speed of light C=3×108m/s
Frequently (f) = ?
Using V = f\lambda (or (– f π for electromagnetic wave)
f = \frac{c}{\lambda} = 3 \times 10^{8} ÷ 10^{-13} = 3 \times 10^{8} \times 10^{13}
= 3 \times 10^{8} \times 10^{13}
= 3 \times 10^{21}Hz
To determine the weight of an object you could ...
Which of the following are true of plane-polarised light? i. Plane polarisation of light is the f...
Electrical resistance is a property of an electrical energy to be converted into ...
Local action is normally prevented from taking place in a simple electric cell by ...
Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible ...
The velocity y of a particle in a time t is given by the equation y = 10 + 2t2 Find the instantan...
If an object just begins to slide on a surface inclined at 30o to the horizontal,the coefficien...