Question

Write the name of EM wave and its wavelength range which is used for

(i) Detecting speed of enemy air-crafts.

(ii) Night photography.

(iii) To preserve food for long hours.​

Answer 1

Answer:

For X rays

f

min

=

λ

max

c

=

5.0×10

−9

m

3.0×10

8

m/s

=6.0×10

16

Hz

and f

max

=

λ

min

c

=

1.0×10

−11

m

3.0×10

8

m/s

=3.0×10

19

Hz