10 QA on electromagnetic spectrum

10 QA on electromagnetic spectrum | Learn Physics

10 Question-Answer on electromagnetic spectrum

1. The wavelength of X-rays is of the order of:

(a) 1 metre

(b) 1 cm

(d) 1 angstrom

Ans: ( d)

2. Which of the following is the largest wave?

(a) X-rays

(b) ϒ – rays

(d) Radio waves

Ans : (d)

3. In which of the following, emission of electrons does not take place

(a) Thermionic emission

(b) X-ray emission

(d) Secondary emission

Ans: ( b)

4. Molybedenum is used as a target element for the production of X-xrays because it is

(a) Light and can easily deflect electrons

(b) Light and can absorb electrons

(d) An element heaving high thermal conductivity

Ans: (c)

5. Which of the following electromagnetic waves have the largest wavelength

(a) Heat waves

(b) Light waves

(d) Microwaves

Ans: ( c)

6. Which of the following is of shortest wave-length?

(a) X-rays

(b) Y-rays

(d) Radio waves

Ans; (b)

7. Radio waves do not penetrate in the band of

(a) Ionosphere

(b) Mesosphere

(d) Stratosphere

Ans: (a)

8. The wavelength of X-rays lies between

(a) Maximum to finite limits

(b) Minimum to certain limits

(d) Infinite to finite limits

Ans: ( b)

9. The penetrating power of X-rays increases with the increase in its

(a) Velocity

(b) Intensity

(d) Wavelength

Ans: (c)

10. Hydrogen atom does not emit X-rays because

(a) It has single electron

(b) It has no neutron

(d) Its energy levels are too close to each other

Ans: ( a)

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