Advertisements
Advertisements
प्रश्न
Solve the numerical problem.
Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 1018 Hz.
Advertisements
उत्तर
Given: c = 3 × 108 , ν = 2 × 1018 Hz
To find: Wavelength (λ)
Formula: c = νλ
Calculation: From formula,
λ = `"c"/ν=(3xx10^8)/(2xx10^18)` = 1.5 × 10−10 = 0.15 nm
The wavelength of an X-ray is 0.15 nm.
APPEARS IN
संबंधित प्रश्न
How are infrared waves produced?
What role dose infra-red radiation play in maintain the Earth’s warmth
What role dose infra-red radiation play in physical therapy?
What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
State an additional use of the X-rays waves
A wave has a wavelength of 10-3 nm. Name the wave.
What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
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.
Name three properties of ultraviolet radiations which are similar to visible light.
Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?
The X-ray beam emerging from an X-ray tube
The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?
The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 1018 Hz. Calculate the value of Planck constant from these data.
(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 radio waves
Name the scientist who discovered Infra-red waves
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
Gamma rays and radio waves travel with the same velocity in free space. Distinguish between them in terms of their origin and the main application.
State three properties of ultra-violet radiation similar to visible light.
What is the wavelength of the wave whose frequency is 1012 Hz? Name the electromagnetic wave.
Choose the correct option.
The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is
Which of the following is a tool used for separating the different color wavelengths from each other?
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?
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.
What is the wavelength range of electromagnetic radiation used in radio broadcast?
