To Which Part of the Electromagnetic Spectrum Does a Wave of Frequency Belong? - Physics


To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?



A wave of frequency 5 × 1011 Hz will belong to the Microwaves of electromagnetic spectrum.

  Is there an error in this question or solution?
2013-2014 (March) All India Set 3

Video TutorialsVIEW ALL [2]


Give a reason for the following:

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

Name the phenomenon which shows the quantum nature of electromagnetic radiation.

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

State Moseley's law

What is the range of the wavelength of the following electromagnetic waves?

(A) Radio waves. 

Name the region beyond the violet end of the spectrum called.

What do you understand by the invisible spectrum? 

State the approximate range of wavelength associated with infrared rays.

Give one use of ultraviolet radiations .

Name the rays or waves used for taking photographs in dark .

Give two properties of ultraviolet radiations which differ from the visible light.

How are X-rays produced?

When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?

X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?

Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be

Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.

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

The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.

Heat at the rate of 200 W is produced in an X-ray tube operating at 20 kV. Find the current in the circuit. Assume that only a small fraction of the kinetic energy of electrons is converted into X-rays.

A certain element emits Kα X-ray of energy 3.69 keV. Use the data from the previous problem to identify the element.

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

The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.

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

If the operating potential in an X-ray tube is increased by 1%, by what percentage does the cutoff wavelength decrease?

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

The short-wavelength limit shifts by 26 pm when the operating voltage in an X-ray tube is increased to 1.5 times the original value. What was the original value of the operating voltage?

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

An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.

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

A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.

(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 Visible light

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.

Name the two waves. compare the speeds of these waves when they travel in vacuum.

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

Name the radiation which can be detected by thermopile.

State one harmful effect each of the ultraviolet and infrared radiation.

To which regions of the electromagnetic spectrum do the following wavelengths belong: 
(a) 250 nm 
(b) 1500 nm 

Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.

Name the part of the electromagnetic spectrum which is: 
Suitable for radar systems used in aircraft navigation.

Name the part of the electromagnetic spectrum which is: 
Produced by bombarding a metal target with high electrons.

Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.

State two uses of infrared radiations.

Choose the correct option.

The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is

Choose the correct option.

Earth’s atmosphere is richest in

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 are microwaves used in radar?

Answer briefly.

Can we produce a pure electric or magnetic wave in space? Why?

Answer briefly.

Does an ordinary electric lamp emit EM waves?

Answer briefly.

Why light waves travel in a vacuum whereas sound waves cannot?

Answer briefly.

What are the ultraviolet rays?

Answer briefly.

Give two uses of ultraviolet rays.

Answer briefly.

Give two uses of radio waves.

Answer briefly.

Name the most harmful radiation entering the Earth's atmosphere from outer space.

Answer briefly.

What is a carrier wave?

Answer briefly.

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

Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 108 m/s.

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.

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

X-rays, gamma rays and microwaves travelling in a vacuum have ______.

A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)

Light of wavelength `3500A` is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons?

The fundamental frequency of an open organ pipe is 300 Hz. The first overtone of this pipe has same frequency as first overtone of a closed organ pipe. If speed of sound is 330 m/s, then the length of closed organ pipe is:

For television broadcasting, the frequency employed is normally

The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-

Following QN ∴ 14, the radiation force on the roof will be

The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of

Ozone layer above the earth's atmosphere will

A radio can tune to any station in the 7.5 mHz to 12 MHz band. What is corresponding wave length band.

SONAR emits which of the following waves?

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

All components of the electromagnetic spectrum in a vacuum have the same ______

The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.

Why does microwave oven heats up a food item containing water molecules most efficiently?

Arrange the following electromagnetic radiation in the ascending order of their frequencies:

X-rays, microwaves, gamma rays, radio waves

The half-value thickness of an absorber is defined as the thickness that will reduce exponentially the intensity of a beam of particles by a factor of 2. The half-value thickness in (µm) for lead assuming X-ray beam of wavelength 20 pm, µ = 50 cm-1 for X-rays in lead at wavelength λ = 20 pm, is ______ µm.

In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.

Given below in the left column are different modes of communication using the kinds of waves given in the right column. 

A.  Optical Fibre
P. Ultrasound
B. Radar Q. Infrared Light
C. Sonar R. Microwaves
D. Mobile Phones  S. Radio Waves

From the options given below, find the most appropriate match between entries in the left and the right column.

Which is the correct ascending order of wavelengths?

Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong? 

Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.


      Forgot password?
Use app×