Question

Please help me to answer
it is in NCERTBooks....11th class​

Answer 1

Answer:

Given that,

vo=7.0×1014s−1

v=1.0×1015s−1

As we know, hv=hv0+21mv2

i.e. h(v−v0)=K.E.

∴K.E.=(6.626×10−34)×(1.0×1015−7.0×1014)=6.626×10−34×1014(10−7)

∴K.E=19.878×10−20J

Explanation:

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