## Question

### Solution

Correct option is As in previous example, the energy of a light-photon of wavelength is 1 joule of energy reaches on the surface per second. number of electrons reaching is 100 photons emit one electron. Hence, the number of electrons emitted is 1 electron has a change of . Hence the charge received from the surface is Rate of the flow of charge is the current. Hence electric current is .

#### SIMILAR QUESTIONS

Q1

X-rays which can penetrate through longer distance in substances are called.

Q2

The target in an X-rays tube should be a:

Q3

The maximum frequency of the X-rays produced in an X-ray tube

Q4

Which one of the following parameters of the emitted X-rays increases when the potential difference between the electrodes of an X-ray tube is increased?

Q5

Calculate the energy of a photon, in electron-volt (eV) and in watt-hour (W h), of wavelength 6600 Å. Q6

An X-rays tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å. What is the maximum energy of a photon in the radiation? What is the order of accelerating voltage (for electrons) required in such a tube? Q7

In an accelerator experiment on high-energy collisions of the electrons with positrons, a certain event is interpreted as the annihilation of an electron-positron pair of total energy 10.2 BeV into two -rays of equal energy. Find the wavelength associated with each -ray. Q8

Energy from Sun is received on earth at the rate of . If average wavelength of solar light is taken as 550 nm, then how many photons are received on earth per meter2 per second? Q9

Monochromatic light of frequency is produced by a laser. The power emitted is . What is the energy of a photon in the light beam?

Q10

Calculate the number of photons emitted per second by a transmitter of 10 kW power, emitting radio waves of wavelength 500 m. 