English
Karnataka Board PUCPUC Science Class 11

Can X-rays Be Used for Photoelectric Effect?

Advertisements
Advertisements

Question

Can X-rays be used for photoelectric effect?

Short/Brief Note
Advertisements

Solution

Yes, X-rays can be use for photoelectric effect. Photoelectric effect is the emission of electrons from a metal surface when the frequency of radiation is greater than the threshold frequency of the metal. For photoelectric effect using X-rays, the energy of the incoming X-ray photon should be greater than the work-function of the metal used.

shaalaa.com
  Is there an error in this question or solution?
Chapter 44: X-rays - Short Answers [Page 393]

APPEARS IN

HC Verma Concepts of Physics Volume 1 and 2 [English]
Chapter 44 X-rays
Short Answers | Q 3 | Page 393

RELATED QUESTIONS

Give a reason for the following:

Long-distance radio broadcasts use short-wave bands. Why?


State an additional use of the X-rays waves


Why are infra-red waves often called heat waves? Explain.


The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?


Name the radiations of wavelength just longer than 8 × 10-7m.


Name the waves used for taking photographs in dark.


Frequencies of Kα X-rays of different materials are measured. Which one of the graphs in the figure may represent the relation between the frequency v and the atomic number ?


For a given material, the energy and wavelength of characteristic X-rays satisfy
(a) E(Kα) > E(Kβ) > E(Kγ)
(b) E(Mα) > E(Lα) > E(Kα)
(c) λ(Kα) > λ(Kβ) > λ(Kγ)
(d) λ(Mα) > λ(Lα) > λ(Kα).


The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength (1/λ) of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength (1/λ) of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


Name the scientist who discovered Microwaves 


Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.


State three properties of infrared radiations similar to that of visible light.


Choose the correct option.

How does the frequency of a beam of ultraviolet light change when it travels from air into glass?


Answer briefly.

Why high-frequency carrier waves are used for the transmission of audio signals?


Solve the numerical problem.

The speed of light is 3 × 108 m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10−7 m.


Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.


If λv, λx and λm Am represents the wavelength of visible light, x-ray and microwaves respectively, then ______.


Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.

Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.


Name two electromagnetic waves of wavelength smaller than that of violet light.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×