"what impact" vs "which impact"

Both "what impact" and "which impact" are correct, but they are used in different contexts. "What impact" is more commonly used to ask about the effect or influence of something. The phrase "which impact" is used when someone is selecting from a specific set of impacts.

Explained by Jennifer
Editor at TextRanch

Last updated: June 15, 2024 • 2072 views

"what impact"

This phrase is correct and commonly used in English to inquire about the effect or influence of something.

Use "what impact" when you want to ask about the effect or influence of a particular action, event, or decision.

Examples:

What impact will the new policy have on our sales?
I wonder what impact the weather will have on the crops.

Show examples from the web [+]

The "Impact" prototype became the EV1.
Is it just me, or did that speaker use the words "impact" and "impactful" constantly?
Therefore your draftsman would like to ask the Commission to provide further clarification of the "financial impact".
Where she says"... 2004, Shiba High School, "there isn't much "impact"
This package, to be debated Wednesday, warns of corruption's "corrosive impact" on Member States' financial resources, the economic integrity of markets and the trust of citizens in their governments.
For consistency reasons, the ECB suggests always referring to the «potential impact» of a decision instead of its «effect» (2).
"Environmental impact" means any adverse change to the environment, wholly or partially resulting from
in paragraph 4, in the eighth line, the word "possible" before "impact" shall be deleted;
(b) in paragraph 4, in the eighth line, the word "possible" before "impact" shall be deleted;
In addition, Member States must adopt National Action Plans for reducing "risks and impacts" of pesticide use on human health and the environment, including timetables and targets for use reduction.
Member States must adopt National Action Plans for reducing "risks and impacts" of pesticide use on human health and the environment, including timetables and targets for use reduction.
Member States must adopt National Action Plans for reducing "risks and impacts" of pesticide use on human health and the environment, including timetables and targets for use reduction.
12. "Environmental impact" means any change to the environment wholly or partially resulting from an EuP during its life cycle;
The addition of "environmental impact" and "production processes or methods" in the Annex will provide for the integration of environmental aspects in the technical specifications, including environmental aspects of the production.
That is probably why the Commission states in the Financial Statement that the measure had "no financial impact".
"environmental impact" shall mean any change to the environment, whether adverse or beneficial, wholly or partially resulting from an organisation's activities, products or services;
The term "EF impact category" is used throughout this Guide in place of the term "impact category" used in ISO 14044.
The term "EF impact category" is used throughout this Guide instead of the term "impact category" used in ISO 14044:2006.
For the purposes of this Chapter "significant adverse impacts" means impacts that compromise ecosystem structure or function in a manner that:
See Commission's "Full impact assessment", SEC(2006)1238...

Alternatives:

what effect
what influence
what consequence
what result
what outcome

"which impact"

This phrase is correct but less commonly used in English. It is typically used when selecting from a specific set of impacts.

Use "which impact" when you are choosing or specifying a particular impact from a known set of impacts.

Examples:

We need to determine which impact is the most significant.
Which impact of the project should we focus on?

Alternatives:

which effect
which influence
which consequence
which result
which outcome

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"what impact" vs "which impact"

"what impact"

"which impact"

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