Question: Q. 10. Name the physical quantity which remains same for microwaves of wavelength $1 \mathrm{~mm}$ and $U V$ radiations of $1600 \AA$ in vacuum.
R [Delhi I, II, III 2012]
Solution:
Ans. Speed (or Velocity).
[CBSE Marking Scheme 2012] 1
Detailed Answer :
It is noted that as both microwaves and UV radiations are electromagnetic radiations, so their speed or velocity, $3 \times 10^{8} \mathrm{~m} / \mathrm{s}$ will remain same in vacuum.
1
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