Question

Which of the following statements are correct?A.gamma rays travel faster than x-rays B.red light has a higher frequency than violet light C.Ultraviolet light and infrared light have the same frequency D.radio waves travel at the same speed as gamma rays

Answer 1

(A). The gamma rays and x-rays are the electromagnetic rays. The speed of the electromagnetic rays is constant.

`c=3*10^8ms^(-1)`

Thus, the gamma rays and x-rays have the same speed.

Hence, option A is incorrect.

(B). The wavelength of the red light is larger than the wavelength of the violet light.

The frequency of light in terms of the wavelength is,

`f=(c)/(\lambda)`

where f is the frequency, c is the speed of light and

`\lambda\text{ is the wavelength}`

As the frequency is inversely propotional to the wavelength of light.

For the larger value of wavelength, the value of frequency is smaller and for the smaller value of the wavelength, the value of frequency is larger.

Thus, the frequency of the red light is smaller than the frequency of the violet light.

Hence, option B is incorrect.

(C). The ultraviolet light and infrared light have different value of wavelength.

Thus, the value of the frequency is not same for both the l