Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

In photoelectric effect, the photocurrent

A
depends both on intensity and frequency of the incident light

B
does not depend on the frequency of photon but depends only on intensity of incident light

C
decrease with increase frequency of incident photon

D
increase with increase of frequency of incident photon.
Question 2
4 / -1

A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photoelectrons is

A
1.07 eV

B
2.66 eV

C
3.74 eV

D
4.81 eV

Solution
Question 3
4 / -1

The threshold frequency for photo electric effect on sodium corresponds to a wavelength of 5000Å. Its work function is

A

B
1J

C

D

Solution
Question 4
4 / -1

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photo electric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes .

A
4 times the original current

B
2 times the original current

C
half the original current

D
zero times the original current
Question 5
4 / -1

X – rays of frequency v are used to irradiate sodium and copper surface in two separate experiments and the stopping potential determined . Then

A
The stopping potential is more for sodium than for copper

B
The stopping potential is more for copper than for sodium

C
The stopping potential is same for sodium and copper

D
The stopping potential depends upon the area of the surface of cathode irridiated and position of anode in photoelectric cell.
Question 6
4 / -1

If E and p are the energy and the momentum of a photon respectively then on increasing the wavelength of photon

A
p and E both will decrease

B
p and E both will increase

C
p will increase and E will decrease

D
p will decreases and E will increase

Solution
Question 7
4 / -1

If the uncertainty in the position of an electron is 10^-10 m, then the value of uncertainty in its momentum (in kg–ms^-1) will be

A

B

C

D

Solution
Question 8
4 / -1

If the X – ray tube is working at 20 kv then the minimum wavelength of X – rays will be

A
0.31Å

B
0.62Å

C
0.93Å

D
0.47Å

Solution
Question 9
4 / -1

An X – ray tube is operated at an accelerating potential of 40 kV and the current in the tube is 20 mA. Only 2% of the total energy given is converted into X – rays. The maximum energy of emitted radiations will be

A

B

C

D

Solution
Question 10
4 / -1

In photoelectric effect, the work function of a metal is 3.5 eV. The emitted electrons can be stopped by applying a potential of –1.2 V. Then

A
the energy of the incident photon is 4.7 eV

B
The energy of the incident photon is 2.3 eV

C
If higher frequency photons be used, the photoelectric current will rise

D
When the energy of photons is 3.5 eV, the photoelectric current will be maximum.

Solution