Q. If the frequency of a wave is doubled, its wavelength (assuming constant speed) is __________.

यदि किसी तरंग की आवृत्ति दोगुनी कर दी जाए, तो उसकी तरंगदैर्घ्य (स्थिर गति मानकर) __________ है।

Halved
आधी

Doubled
दोगुनी

Unchanged
स्थिर

Quadrupled
चार गुना

From $v = f \lambda$ , if v is constant and f is doubled, then:
$λ = \frac{v}{f}$
So doubling frequency halves the wavelength.

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